I have a model written in IBM Ilog Script, invoking and using CP optimizer [first line is using CP;]. IBM Optimization Studio reports 1 solution, but when reviewing the variables and constraints, the values don't compute.

For example, a decision variable (dec3) equals -10, but the two decision variables (dec1 and dec2) don't add to -10 (call this constraint1). This occurs multiple times over other constraints involving other decision variables.

ct 1: dec1 + dec2 == dec3;

Yet, this is the solution I'm being provided with. There is nothing displayed in the relaxation tab. I don't get any errors that might suggest the programming language used is problematic, or any other issues.

Is this supposed to be how it works?

------------------------------
Stevie Turkington
------------------------------

Hi,

can you share a small model so that other users could try ?

And just to be sure , do you get the same issue if you turn

ct 1: dec1 + dec2 == dec3;

into

 dec1 + dec2 == dec3;

?

regards

------------------------------
[Alex] [Fleischer]
[Data and AI Technical Sales]
[IBM]

Original Message:
Sent: Thu November 06, 2025 01:47 AM
From: Stevie Turkington
Subject: CP Optimizer - Solution Issue?

I have a model written in IBM Ilog Script, invoking and using CP optimizer [first line is using CP;]. IBM Optimization Studio reports 1 solution, but when reviewing the variables and constraints, the values don't compute.

For example, a decision variable (dec3) equals -10, but the two decision variables (dec1 and dec2) don't add to -10 (call this constraint1). This occurs multiple times over other constraints involving other decision variables.

ct 1: dec1 + dec2 == dec3;

Yet, this is the solution I'm being provided with. There is nothing displayed in the relaxation tab. I don't get any errors that might suggest the programming language used is problematic, or any other issues.

Is this supposed to be how it works?

------------------------------
Stevie Turkington
------------------------------

Thanks, I'll give that a go.

I am also trying to define particular values three variables can take on. These variables are also mentioned in the subject to area, and I'm getting plenty of 'not a range type' through to 'Operator not available for dexpr int - {string}.' messages trying the various ways to get this done (I have no clue what to do, and suggestions from ChatGPT and other posts in this forum haven't resulted in no errors appearing).

How do I go about doing this in ILOG Ilog scripting language? If there are multiple parts, where does each go (eg define parameters section, define decision variables section, subject to (constraints) section.

Hi,

can you share a small model so that other users could try ?

And just to be sure , do you get the same issue if you turn

ct 1: dec1 + dec2 == dec3;

into

 dec1 + dec2 == dec3;

?

regards

------------------------------
[Alex] [Fleischer]
[Data and AI Technical Sales]
[IBM]

Original Message:
Sent: Thu November 06, 2025 01:47 AM
From: Stevie Turkington
Subject: CP Optimizer - Solution Issue?

I have a model written in IBM Ilog Script, invoking and using CP optimizer [first line is using CP;]. IBM Optimization Studio reports 1 solution, but when reviewing the variables and constraints, the values don't compute.

For example, a decision variable (dec3) equals -10, but the two decision variables (dec1 and dec2) don't add to -10 (call this constraint1). This occurs multiple times over other constraints involving other decision variables.

ct 1: dec1 + dec2 == dec3;

Yet, this is the solution I'm being provided with. There is nothing displayed in the relaxation tab. I don't get any errors that might suggest the programming language used is problematic, or any other issues.

Is this supposed to be how it works?

------------------------------
Stevie Turkington
------------------------------

Hi,

let me share a tiny example that works fine:

using CP;range r=1..3;{int} s={1,3};dvar int x;dvar int y in r;dvar int z in 1..3;dvar int t;subject to{  x in {1,2,3};  y==z;  t in s;}

and I shared a few OPL scripting examples at here

Thanks, I'll give that a go.

I am also trying to define particular values three variables can take on. These variables are also mentioned in the subject to area, and I'm getting plenty of 'not a range type' through to 'Operator not available for dexpr int - {string}.' messages trying the various ways to get this done (I have no clue what to do, and suggestions from ChatGPT and other posts in this forum haven't resulted in no errors appearing).

How do I go about doing this in ILOG Ilog scripting language? If there are multiple parts, where does each go (eg define parameters section, define decision variables section, subject to (constraints) section.

Hi,

can you share a small model so that other users could try ?

And just to be sure , do you get the same issue if you turn

ct 1: dec1 + dec2 == dec3;

into

 dec1 + dec2 == dec3;

?

regards

------------------------------
[Alex] [Fleischer]
[Data and AI Technical Sales]
[IBM]

Original Message:
Sent: Thu November 06, 2025 01:47 AM
From: Stevie Turkington
Subject: CP Optimizer - Solution Issue?

I have a model written in IBM Ilog Script, invoking and using CP optimizer [first line is using CP;]. IBM Optimization Studio reports 1 solution, but when reviewing the variables and constraints, the values don't compute.

For example, a decision variable (dec3) equals -10, but the two decision variables (dec1 and dec2) don't add to -10 (call this constraint1). This occurs multiple times over other constraints involving other decision variables.

ct 1: dec1 + dec2 == dec3;

Yet, this is the solution I'm being provided with. There is nothing displayed in the relaxation tab. I don't get any errors that might suggest the programming language used is problematic, or any other issues.

Is this supposed to be how it works?

------------------------------
Stevie Turkington
------------------------------

Thanks for your help, Alex.

I am encountering "Opl process is not responding, you must relaunch the run configuration" an awful lot. In cmd using oplrun.exe, I think the engine is stuck at node 0 - nothing further gets displayed. I don't believe any process stops responding in the cmd instance. I give up after a while, though.

Are there equivalent settings for CP Optimizer I can set in IDE that refer to the following suggestions: here and here #2

Hi,

let me share a tiny example that works fine:

using CP;range r=1..3;{int} s={1,3};dvar int x;dvar int y in r;dvar int z in 1..3;dvar int t;subject to{  x in {1,2,3};  y==z;  t in s;}

and I shared a few OPL scripting examples at here

Thanks, I'll give that a go.

I am also trying to define particular values three variables can take on. These variables are also mentioned in the subject to area, and I'm getting plenty of 'not a range type' through to 'Operator not available for dexpr int - {string}.' messages trying the various ways to get this done (I have no clue what to do, and suggestions from ChatGPT and other posts in this forum haven't resulted in no errors appearing).

How do I go about doing this in ILOG Ilog scripting language? If there are multiple parts, where does each go (eg define parameters section, define decision variables section, subject to (constraints) section.

Hi,

can you share a small model so that other users could try ?

And just to be sure , do you get the same issue if you turn

ct 1: dec1 + dec2 == dec3;

into

 dec1 + dec2 == dec3;

?

regards

------------------------------
[Alex] [Fleischer]
[Data and AI Technical Sales]
[IBM]

Original Message:
Sent: Thu November 06, 2025 01:47 AM
From: Stevie Turkington
Subject: CP Optimizer - Solution Issue?

I have a model written in IBM Ilog Script, invoking and using CP optimizer [first line is using CP;]. IBM Optimization Studio reports 1 solution, but when reviewing the variables and constraints, the values don't compute.

For example, a decision variable (dec3) equals -10, but the two decision variables (dec1 and dec2) don't add to -10 (call this constraint1). This occurs multiple times over other constraints involving other decision variables.

ct 1: dec1 + dec2 == dec3;

Yet, this is the solution I'm being provided with. There is nothing displayed in the relaxation tab. I don't get any errors that might suggest the programming language used is problematic, or any other issues.

Is this supposed to be how it works?

------------------------------
Stevie Turkington
------------------------------

Hi,

if you get this issue after a while you could try

execute {  		cp.param.FailLimit = 5000;}

in order not to let CPOptimizer explore for too long.

You could also set a time limit.

You can also first try with a smaller instance.

regards

Thanks for your help, Alex.

I am encountering "Opl process is not responding, you must relaunch the run configuration" an awful lot. In cmd using oplrun.exe, I think the engine is stuck at node 0 - nothing further gets displayed. I don't believe any process stops responding in the cmd instance. I give up after a while, though.

Are there equivalent settings for CP Optimizer I can set in IDE that refer to the following suggestions: here and here #2

Hi,

let me share a tiny example that works fine:

using CP;range r=1..3;{int} s={1,3};dvar int x;dvar int y in r;dvar int z in 1..3;dvar int t;subject to{  x in {1,2,3};  y==z;  t in s;}

and I shared a few OPL scripting examples at here

Thanks, I'll give that a go.

I am also trying to define particular values three variables can take on. These variables are also mentioned in the subject to area, and I'm getting plenty of 'not a range type' through to 'Operator not available for dexpr int - {string}.' messages trying the various ways to get this done (I have no clue what to do, and suggestions from ChatGPT and other posts in this forum haven't resulted in no errors appearing).

How do I go about doing this in ILOG Ilog scripting language? If there are multiple parts, where does each go (eg define parameters section, define decision variables section, subject to (constraints) section.

Hi,

can you share a small model so that other users could try ?

And just to be sure , do you get the same issue if you turn

ct 1: dec1 + dec2 == dec3;

into

 dec1 + dec2 == dec3;

?

regards

------------------------------
[Alex] [Fleischer]
[Data and AI Technical Sales]
[IBM]

Original Message:
Sent: Thu November 06, 2025 01:47 AM
From: Stevie Turkington
Subject: CP Optimizer - Solution Issue?

I have a model written in IBM Ilog Script, invoking and using CP optimizer [first line is using CP;]. IBM Optimization Studio reports 1 solution, but when reviewing the variables and constraints, the values don't compute.

For example, a decision variable (dec3) equals -10, but the two decision variables (dec1 and dec2) don't add to -10 (call this constraint1). This occurs multiple times over other constraints involving other decision variables.

ct 1: dec1 + dec2 == dec3;

Yet, this is the solution I'm being provided with. There is nothing displayed in the relaxation tab. I don't get any errors that might suggest the programming language used is problematic, or any other issues.

Is this supposed to be how it works?

------------------------------
Stevie Turkington
------------------------------

I am running the model on watsonx Machine Learning. Using the same code (but now with the data in the model), I get an optimal solution but I can't find out which values got assigned to the decision variables (DV). Note, I am using 'using CP;' at the top.

What is required to obtain this data from the solution process? It displays 3 solutions were found but all I see is what the optimal value is. I'm more interested in the values assigned to the DVs.

Note, there is no data in the prepare data section of the scenario. That is contained in the model itself. Uploading the .dat file, associated with the model, in the prepare data section doesn't upload cleanly.

eg: int startnum4 = ...;

becomes

int startnum4 = 97;

Hi,

if you get this issue after a while you could try

execute {  		cp.param.FailLimit = 5000;}

in order not to let CPOptimizer explore for too long.

You could also set a time limit.

You can also first try with a smaller instance.

regards

Thanks for your help, Alex.

I am encountering "Opl process is not responding, you must relaunch the run configuration" an awful lot. In cmd using oplrun.exe, I think the engine is stuck at node 0 - nothing further gets displayed. I don't believe any process stops responding in the cmd instance. I give up after a while, though.

Are there equivalent settings for CP Optimizer I can set in IDE that refer to the following suggestions: here and here #2

Hi,

let me share a tiny example that works fine:

using CP;range r=1..3;{int} s={1,3};dvar int x;dvar int y in r;dvar int z in 1..3;dvar int t;subject to{  x in {1,2,3};  y==z;  t in s;}

and I shared a few OPL scripting examples at here

Thanks, I'll give that a go.

I am also trying to define particular values three variables can take on. These variables are also mentioned in the subject to area, and I'm getting plenty of 'not a range type' through to 'Operator not available for dexpr int - {string}.' messages trying the various ways to get this done (I have no clue what to do, and suggestions from ChatGPT and other posts in this forum haven't resulted in no errors appearing).

How do I go about doing this in ILOG Ilog scripting language? If there are multiple parts, where does each go (eg define parameters section, define decision variables section, subject to (constraints) section.

Hi,

can you share a small model so that other users could try ?

And just to be sure , do you get the same issue if you turn

ct 1: dec1 + dec2 == dec3;

into

 dec1 + dec2 == dec3;

?

regards

------------------------------
[Alex] [Fleischer]
[Data and AI Technical Sales]
[IBM]

Original Message:
Sent: Thu November 06, 2025 01:47 AM
From: Stevie Turkington
Subject: CP Optimizer - Solution Issue?

I have a model written in IBM Ilog Script, invoking and using CP optimizer [first line is using CP;]. IBM Optimization Studio reports 1 solution, but when reviewing the variables and constraints, the values don't compute.

For example, a decision variable (dec3) equals -10, but the two decision variables (dec1 and dec2) don't add to -10 (call this constraint1). This occurs multiple times over other constraints involving other decision variables.

ct 1: dec1 + dec2 == dec3;

Yet, this is the solution I'm being provided with. There is nothing displayed in the relaxation tab. I don't get any errors that might suggest the programming language used is problematic, or any other issues.

Is this supposed to be how it works?

------------------------------
Stevie Turkington
------------------------------

Hi

in the OPL documentation you can see

have you done that ?

regards

regards

I am running the model on watsonx Machine Learning. Using the same code (but now with the data in the model), I get an optimal solution but I can't find out which values got assigned to the decision variables (DV). Note, I am using 'using CP;' at the top.

What is required to obtain this data from the solution process? It displays 3 solutions were found but all I see is what the optimal value is. I'm more interested in the values assigned to the DVs.

Note, there is no data in the prepare data section of the scenario. That is contained in the model itself. Uploading the .dat file, associated with the model, in the prepare data section doesn't upload cleanly.

eg: int startnum4 = ...;

becomes

int startnum4 = 97;

Hi,

if you get this issue after a while you could try

execute {  		cp.param.FailLimit = 5000;}

in order not to let CPOptimizer explore for too long.

You could also set a time limit.

You can also first try with a smaller instance.

regards

Thanks for your help, Alex.

I am encountering "Opl process is not responding, you must relaunch the run configuration" an awful lot. In cmd using oplrun.exe, I think the engine is stuck at node 0 - nothing further gets displayed. I don't believe any process stops responding in the cmd instance. I give up after a while, though.

Are there equivalent settings for CP Optimizer I can set in IDE that refer to the following suggestions: here and here #2

Hi,

let me share a tiny example that works fine:

using CP;range r=1..3;{int} s={1,3};dvar int x;dvar int y in r;dvar int z in 1..3;dvar int t;subject to{  x in {1,2,3};  y==z;  t in s;}

and I shared a few OPL scripting examples at here

Thanks, I'll give that a go.

I am also trying to define particular values three variables can take on. These variables are also mentioned in the subject to area, and I'm getting plenty of 'not a range type' through to 'Operator not available for dexpr int - {string}.' messages trying the various ways to get this done (I have no clue what to do, and suggestions from ChatGPT and other posts in this forum haven't resulted in no errors appearing).

How do I go about doing this in ILOG Ilog scripting language? If there are multiple parts, where does each go (eg define parameters section, define decision variables section, subject to (constraints) section.

Hi,

can you share a small model so that other users could try ?

And just to be sure , do you get the same issue if you turn

ct 1: dec1 + dec2 == dec3;

into

 dec1 + dec2 == dec3;

?

regards

------------------------------
[Alex] [Fleischer]
[Data and AI Technical Sales]
[IBM]

Original Message:
Sent: Thu November 06, 2025 01:47 AM
From: Stevie Turkington
Subject: CP Optimizer - Solution Issue?

I have a model written in IBM Ilog Script, invoking and using CP optimizer [first line is using CP;]. IBM Optimization Studio reports 1 solution, but when reviewing the variables and constraints, the values don't compute.

For example, a decision variable (dec3) equals -10, but the two decision variables (dec1 and dec2) don't add to -10 (call this constraint1). This occurs multiple times over other constraints involving other decision variables.

ct 1: dec1 + dec2 == dec3;

Yet, this is the solution I'm being provided with. There is nothing displayed in the relaxation tab. I don't get any errors that might suggest the programming language used is problematic, or any other issues.

Is this supposed to be how it works?

------------------------------
Stevie Turkington
------------------------------

I am running the code directly in watsonx (decision optimization) cloud service, not through Optimization Studio to the cloud. I still cannot see what the feasible solutions are. How can I?

Hi

in the OPL documentation you can see

have you done that ?

regards

regards

I am running the model on watsonx Machine Learning. Using the same code (but now with the data in the model), I get an optimal solution but I can't find out which values got assigned to the decision variables (DV). Note, I am using 'using CP;' at the top.

What is required to obtain this data from the solution process? It displays 3 solutions were found but all I see is what the optimal value is. I'm more interested in the values assigned to the DVs.

Note, there is no data in the prepare data section of the scenario. That is contained in the model itself. Uploading the .dat file, associated with the model, in the prepare data section doesn't upload cleanly.

eg: int startnum4 = ...;

becomes

int startnum4 = 97;

Hi,

if you get this issue after a while you could try

execute {  		cp.param.FailLimit = 5000;}

in order not to let CPOptimizer explore for too long.

You could also set a time limit.

You can also first try with a smaller instance.

regards

Thanks for your help, Alex.

I am encountering "Opl process is not responding, you must relaunch the run configuration" an awful lot. In cmd using oplrun.exe, I think the engine is stuck at node 0 - nothing further gets displayed. I don't believe any process stops responding in the cmd instance. I give up after a while, though.

Are there equivalent settings for CP Optimizer I can set in IDE that refer to the following suggestions: here and here #2

Hi,

let me share a tiny example that works fine:

using CP;range r=1..3;{int} s={1,3};dvar int x;dvar int y in r;dvar int z in 1..3;dvar int t;subject to{  x in {1,2,3};  y==z;  t in s;}

and I shared a few OPL scripting examples at here

Thanks, I'll give that a go.

I am also trying to define particular values three variables can take on. These variables are also mentioned in the subject to area, and I'm getting plenty of 'not a range type' through to 'Operator not available for dexpr int - {string}.' messages trying the various ways to get this done (I have no clue what to do, and suggestions from ChatGPT and other posts in this forum haven't resulted in no errors appearing).

How do I go about doing this in ILOG Ilog scripting language? If there are multiple parts, where does each go (eg define parameters section, define decision variables section, subject to (constraints) section.

Hi,

can you share a small model so that other users could try ?

And just to be sure , do you get the same issue if you turn

ct 1: dec1 + dec2 == dec3;

into

 dec1 + dec2 == dec3;

?

regards

------------------------------
[Alex] [Fleischer]
[Data and AI Technical Sales]
[IBM]

Original Message:
Sent: Thu November 06, 2025 01:47 AM
From: Stevie Turkington
Subject: CP Optimizer - Solution Issue?

I have a model written in IBM Ilog Script, invoking and using CP optimizer [first line is using CP;]. IBM Optimization Studio reports 1 solution, but when reviewing the variables and constraints, the values don't compute.

For example, a decision variable (dec3) equals -10, but the two decision variables (dec1 and dec2) don't add to -10 (call this constraint1). This occurs multiple times over other constraints involving other decision variables.

ct 1: dec1 + dec2 == dec3;

Yet, this is the solution I'm being provided with. There is nothing displayed in the relaxation tab. I don't get any errors that might suggest the programming language used is problematic, or any other issues.

Is this supposed to be how it works?

------------------------------
Stevie Turkington
------------------------------

Hi,

you need to have your solutions in a tuple set.

Let me give your an example with the zoo example.

In the studio within watsonx ai, in OPL you will write

int nbKids=300;float costBus40=500;float costBus30=400;dvar int+ nbBus40;dvar int+ nbBus30;minimize costBus40*nbBus40  +nbBus30*costBus30;subject to{ 40*nbBus40+nbBus30*30>=nbKids;}tuple res{    key int si;    int nb;}{res} r= {};execute{    r.add(40,nbBus40);    r.add(30,nbBus30);}

and then you will see

I am running the code directly in watsonx (decision optimization) cloud service, not through Optimization Studio to the cloud. I still cannot see what the feasible solutions are. How can I?

Hi

in the OPL documentation you can see

have you done that ?

regards

regards

I am running the model on watsonx Machine Learning. Using the same code (but now with the data in the model), I get an optimal solution but I can't find out which values got assigned to the decision variables (DV). Note, I am using 'using CP;' at the top.

What is required to obtain this data from the solution process? It displays 3 solutions were found but all I see is what the optimal value is. I'm more interested in the values assigned to the DVs.

Note, there is no data in the prepare data section of the scenario. That is contained in the model itself. Uploading the .dat file, associated with the model, in the prepare data section doesn't upload cleanly.

eg: int startnum4 = ...;

becomes

int startnum4 = 97;

Hi,

if you get this issue after a while you could try

execute {  		cp.param.FailLimit = 5000;}

in order not to let CPOptimizer explore for too long.

You could also set a time limit.

You can also first try with a smaller instance.

regards

Thanks for your help, Alex.

I am encountering "Opl process is not responding, you must relaunch the run configuration" an awful lot. In cmd using oplrun.exe, I think the engine is stuck at node 0 - nothing further gets displayed. I don't believe any process stops responding in the cmd instance. I give up after a while, though.

Are there equivalent settings for CP Optimizer I can set in IDE that refer to the following suggestions: here and here #2

Hi,

let me share a tiny example that works fine:

using CP;range r=1..3;{int} s={1,3};dvar int x;dvar int y in r;dvar int z in 1..3;dvar int t;subject to{  x in {1,2,3};  y==z;  t in s;}

and I shared a few OPL scripting examples at here

Thanks, I'll give that a go.

I am also trying to define particular values three variables can take on. These variables are also mentioned in the subject to area, and I'm getting plenty of 'not a range type' through to 'Operator not available for dexpr int - {string}.' messages trying the various ways to get this done (I have no clue what to do, and suggestions from ChatGPT and other posts in this forum haven't resulted in no errors appearing).

How do I go about doing this in ILOG Ilog scripting language? If there are multiple parts, where does each go (eg define parameters section, define decision variables section, subject to (constraints) section.

Hi,

can you share a small model so that other users could try ?

And just to be sure , do you get the same issue if you turn

ct 1: dec1 + dec2 == dec3;

into

 dec1 + dec2 == dec3;

?

regards

------------------------------
[Alex] [Fleischer]
[Data and AI Technical Sales]
[IBM]

Original Message:
Sent: Thu November 06, 2025 01:47 AM
From: Stevie Turkington
Subject: CP Optimizer - Solution Issue?

I have a model written in IBM Ilog Script, invoking and using CP optimizer [first line is using CP;]. IBM Optimization Studio reports 1 solution, but when reviewing the variables and constraints, the values don't compute.

For example, a decision variable (dec3) equals -10, but the two decision variables (dec1 and dec2) don't add to -10 (call this constraint1). This occurs multiple times over other constraints involving other decision variables.

ct 1: dec1 + dec2 == dec3;

Yet, this is the solution I'm being provided with. There is nothing displayed in the relaxation tab. I don't get any errors that might suggest the programming language used is problematic, or any other issues.

Is this supposed to be how it works?

------------------------------
Stevie Turkington
------------------------------

Thanks, Alex! I managed to get this working for my model.

Is there any way to have all feasible solution data downloadable after the run ends (via timeout), rather than only see the most recent feasible solution?

Hi,

you need to have your solutions in a tuple set.

Let me give your an example with the zoo example.

In the studio within watsonx ai, in OPL you will write

int nbKids=300;float costBus40=500;float costBus30=400;dvar int+ nbBus40;dvar int+ nbBus30;minimize costBus40*nbBus40  +nbBus30*costBus30;subject to{ 40*nbBus40+nbBus30*30>=nbKids;}tuple res{    key int si;    int nb;}{res} r= {};execute{    r.add(40,nbBus40);    r.add(30,nbBus30);}

and then you will see

I am running the code directly in watsonx (decision optimization) cloud service, not through Optimization Studio to the cloud. I still cannot see what the feasible solutions are. How can I?

Hi

in the OPL documentation you can see

have you done that ?

regards

regards

I am running the model on watsonx Machine Learning. Using the same code (but now with the data in the model), I get an optimal solution but I can't find out which values got assigned to the decision variables (DV). Note, I am using 'using CP;' at the top.

What is required to obtain this data from the solution process? It displays 3 solutions were found but all I see is what the optimal value is. I'm more interested in the values assigned to the DVs.

Note, there is no data in the prepare data section of the scenario. That is contained in the model itself. Uploading the .dat file, associated with the model, in the prepare data section doesn't upload cleanly.

eg: int startnum4 = ...;

becomes

int startnum4 = 97;

Hi,

if you get this issue after a while you could try

execute {  		cp.param.FailLimit = 5000;}

in order not to let CPOptimizer explore for too long.

You could also set a time limit.

You can also first try with a smaller instance.

regards

Thanks for your help, Alex.

I am encountering "Opl process is not responding, you must relaunch the run configuration" an awful lot. In cmd using oplrun.exe, I think the engine is stuck at node 0 - nothing further gets displayed. I don't believe any process stops responding in the cmd instance. I give up after a while, though.

Are there equivalent settings for CP Optimizer I can set in IDE that refer to the following suggestions: here and here #2

Hi,

let me share a tiny example that works fine:

using CP;range r=1..3;{int} s={1,3};dvar int x;dvar int y in r;dvar int z in 1..3;dvar int t;subject to{  x in {1,2,3};  y==z;  t in s;}

and I shared a few OPL scripting examples at here

Thanks, I'll give that a go.

I am also trying to define particular values three variables can take on. These variables are also mentioned in the subject to area, and I'm getting plenty of 'not a range type' through to 'Operator not available for dexpr int - {string}.' messages trying the various ways to get this done (I have no clue what to do, and suggestions from ChatGPT and other posts in this forum haven't resulted in no errors appearing).

How do I go about doing this in ILOG Ilog scripting language? If there are multiple parts, where does each go (eg define parameters section, define decision variables section, subject to (constraints) section.

Hi,

can you share a small model so that other users could try ?

And just to be sure , do you get the same issue if you turn

ct 1: dec1 + dec2 == dec3;

into

 dec1 + dec2 == dec3;

?

regards

------------------------------
[Alex] [Fleischer]
[Data and AI Technical Sales]
[IBM]

Original Message:
Sent: Thu November 06, 2025 01:47 AM
From: Stevie Turkington
Subject: CP Optimizer - Solution Issue?

I have a model written in IBM Ilog Script, invoking and using CP optimizer [first line is using CP;]. IBM Optimization Studio reports 1 solution, but when reviewing the variables and constraints, the values don't compute.

For example, a decision variable (dec3) equals -10, but the two decision variables (dec1 and dec2) don't add to -10 (call this constraint1). This occurs multiple times over other constraints involving other decision variables.

ct 1: dec1 + dec2 == dec3;

Yet, this is the solution I'm being provided with. There is nothing displayed in the relaxation tab. I don't get any errors that might suggest the programming language used is problematic, or any other issues.

Is this supposed to be how it works?

------------------------------
Stevie Turkington
------------------------------

Hi,

you could either handle that through the API call or directly in OPL.

Let me change slightly this

using CP;int nbKids=300;float costBus40=500;float costBus30=400;tuple res{    key int si;    int nb;}{res} r= {};     dvar int+ nbBus40;dvar int+ nbBus30;     minimize     costBus40*nbBus40  +nbBus30*costBus30;     subject to{     40*nbBus40+nbBus30*30>=nbKids;}execute{    writeln("nbBus40 = ",nbBus40," and nbBus30 = ",nbBus30," and the cost is ",costBus40*nbBus40  +nbBus30*costBus30);    r.add(nbBus40,nbBus30);}main{cp.param.SearchType=24;cp.param.workers=1;thisOplModel.generate();cp.startNewSearch();while(cp.next()) {  thisOplModel.postProcess(); }writeln("r = ",thisOplModel.r);} 

which gives

nbBus40 = 8 and nbBus30 = 0 and the cost is 4000nbBus40 = 3 and nbBus30 = 6 and the cost is 3900nbBus40 = 6 and nbBus30 = 2 and the cost is 3800r =  {<8 0> <3 6> <6 2>}

Thanks, Alex! I managed to get this working for my model.

Is there any way to have all feasible solution data downloadable after the run ends (via timeout), rather than only see the most recent feasible solution?

Hi,

you need to have your solutions in a tuple set.

Let me give your an example with the zoo example.

In the studio within watsonx ai, in OPL you will write

int nbKids=300;float costBus40=500;float costBus30=400;dvar int+ nbBus40;dvar int+ nbBus30;minimize costBus40*nbBus40  +nbBus30*costBus30;subject to{ 40*nbBus40+nbBus30*30>=nbKids;}tuple res{    key int si;    int nb;}{res} r= {};execute{    r.add(40,nbBus40);    r.add(30,nbBus30);}

and then you will see

I am running the code directly in watsonx (decision optimization) cloud service, not through Optimization Studio to the cloud. I still cannot see what the feasible solutions are. How can I?

Hi

in the OPL documentation you can see

have you done that ?

regards

regards

I am running the model on watsonx Machine Learning. Using the same code (but now with the data in the model), I get an optimal solution but I can't find out which values got assigned to the decision variables (DV). Note, I am using 'using CP;' at the top.

What is required to obtain this data from the solution process? It displays 3 solutions were found but all I see is what the optimal value is. I'm more interested in the values assigned to the DVs.

Note, there is no data in the prepare data section of the scenario. That is contained in the model itself. Uploading the .dat file, associated with the model, in the prepare data section doesn't upload cleanly.

eg: int startnum4 = ...;

becomes

int startnum4 = 97;

Hi,

if you get this issue after a while you could try

execute {  		cp.param.FailLimit = 5000;}

in order not to let CPOptimizer explore for too long.

You could also set a time limit.

You can also first try with a smaller instance.

regards

Thanks for your help, Alex.

I am encountering "Opl process is not responding, you must relaunch the run configuration" an awful lot. In cmd using oplrun.exe, I think the engine is stuck at node 0 - nothing further gets displayed. I don't believe any process stops responding in the cmd instance. I give up after a while, though.

Are there equivalent settings for CP Optimizer I can set in IDE that refer to the following suggestions: here and here #2

Hi,

let me share a tiny example that works fine:

using CP;range r=1..3;{int} s={1,3};dvar int x;dvar int y in r;dvar int z in 1..3;dvar int t;subject to{  x in {1,2,3};  y==z;  t in s;}

and I shared a few OPL scripting examples at here

Thanks, I'll give that a go.

I am also trying to define particular values three variables can take on. These variables are also mentioned in the subject to area, and I'm getting plenty of 'not a range type' through to 'Operator not available for dexpr int - {string}.' messages trying the various ways to get this done (I have no clue what to do, and suggestions from ChatGPT and other posts in this forum haven't resulted in no errors appearing).

How do I go about doing this in ILOG Ilog scripting language? If there are multiple parts, where does each go (eg define parameters section, define decision variables section, subject to (constraints) section.

Hi,

can you share a small model so that other users could try ?

And just to be sure , do you get the same issue if you turn

ct 1: dec1 + dec2 == dec3;

into

 dec1 + dec2 == dec3;

?

regards

------------------------------
[Alex] [Fleischer]
[Data and AI Technical Sales]
[IBM]

Original Message:
Sent: Thu November 06, 2025 01:47 AM
From: Stevie Turkington
Subject: CP Optimizer - Solution Issue?

I have a model written in IBM Ilog Script, invoking and using CP optimizer [first line is using CP;]. IBM Optimization Studio reports 1 solution, but when reviewing the variables and constraints, the values don't compute.

For example, a decision variable (dec3) equals -10, but the two decision variables (dec1 and dec2) don't add to -10 (call this constraint1). This occurs multiple times over other constraints involving other decision variables.

ct 1: dec1 + dec2 == dec3;

Yet, this is the solution I'm being provided with. There is nothing displayed in the relaxation tab. I don't get any errors that might suggest the programming language used is problematic, or any other issues.

Is this supposed to be how it works?

------------------------------
Stevie Turkington
------------------------------

Happy New Year, Alex!

Is there a way to overcome this error:

Tuple component type not supported., "2147483647".

Hi,

you could either handle that through the API call or directly in OPL.

Let me change slightly this

using CP;int nbKids=300;float costBus40=500;float costBus30=400;tuple res{    key int si;    int nb;}{res} r= {};     dvar int+ nbBus40;dvar int+ nbBus30;     minimize     costBus40*nbBus40  +nbBus30*costBus30;     subject to{     40*nbBus40+nbBus30*30>=nbKids;}execute{    writeln("nbBus40 = ",nbBus40," and nbBus30 = ",nbBus30," and the cost is ",costBus40*nbBus40  +nbBus30*costBus30);    r.add(nbBus40,nbBus30);}main{cp.param.SearchType=24;cp.param.workers=1;thisOplModel.generate();cp.startNewSearch();while(cp.next()) {  thisOplModel.postProcess(); }writeln("r = ",thisOplModel.r);} 

which gives

nbBus40 = 8 and nbBus30 = 0 and the cost is 4000nbBus40 = 3 and nbBus30 = 6 and the cost is 3900nbBus40 = 6 and nbBus30 = 2 and the cost is 3800r =  {<8 0> <3 6> <6 2>}

Thanks, Alex! I managed to get this working for my model.

Is there any way to have all feasible solution data downloadable after the run ends (via timeout), rather than only see the most recent feasible solution?

Hi,

you need to have your solutions in a tuple set.

Let me give your an example with the zoo example.

In the studio within watsonx ai, in OPL you will write

int nbKids=300;float costBus40=500;float costBus30=400;dvar int+ nbBus40;dvar int+ nbBus30;minimize costBus40*nbBus40  +nbBus30*costBus30;subject to{ 40*nbBus40+nbBus30*30>=nbKids;}tuple res{    key int si;    int nb;}{res} r= {};execute{    r.add(40,nbBus40);    r.add(30,nbBus30);}

and then you will see

I am running the code directly in watsonx (decision optimization) cloud service, not through Optimization Studio to the cloud. I still cannot see what the feasible solutions are. How can I?

Hi

in the OPL documentation you can see

have you done that ?

regards

regards

I am running the model on watsonx Machine Learning. Using the same code (but now with the data in the model), I get an optimal solution but I can't find out which values got assigned to the decision variables (DV). Note, I am using 'using CP;' at the top.

What is required to obtain this data from the solution process? It displays 3 solutions were found but all I see is what the optimal value is. I'm more interested in the values assigned to the DVs.

Note, there is no data in the prepare data section of the scenario. That is contained in the model itself. Uploading the .dat file, associated with the model, in the prepare data section doesn't upload cleanly.

eg: int startnum4 = ...;

becomes

int startnum4 = 97;

Hi,

if you get this issue after a while you could try

execute {  		cp.param.FailLimit = 5000;}

in order not to let CPOptimizer explore for too long.

You could also set a time limit.

You can also first try with a smaller instance.

regards

Thanks for your help, Alex.

I am encountering "Opl process is not responding, you must relaunch the run configuration" an awful lot. In cmd using oplrun.exe, I think the engine is stuck at node 0 - nothing further gets displayed. I don't believe any process stops responding in the cmd instance. I give up after a while, though.

Are there equivalent settings for CP Optimizer I can set in IDE that refer to the following suggestions: here and here #2

Hi,

let me share a tiny example that works fine:

using CP;range r=1..3;{int} s={1,3};dvar int x;dvar int y in r;dvar int z in 1..3;dvar int t;subject to{  x in {1,2,3};  y==z;  t in s;}

and I shared a few OPL scripting examples at here

Thanks, I'll give that a go.

I am also trying to define particular values three variables can take on. These variables are also mentioned in the subject to area, and I'm getting plenty of 'not a range type' through to 'Operator not available for dexpr int - {string}.' messages trying the various ways to get this done (I have no clue what to do, and suggestions from ChatGPT and other posts in this forum haven't resulted in no errors appearing).

How do I go about doing this in ILOG Ilog scripting language? If there are multiple parts, where does each go (eg define parameters section, define decision variables section, subject to (constraints) section.

Hi,

can you share a small model so that other users could try ?

And just to be sure , do you get the same issue if you turn

ct 1: dec1 + dec2 == dec3;

into

 dec1 + dec2 == dec3;

?

regards

------------------------------
[Alex] [Fleischer]
[Data and AI Technical Sales]
[IBM]

Original Message:
Sent: Thu November 06, 2025 01:47 AM
From: Stevie Turkington
Subject: CP Optimizer - Solution Issue?

I have a model written in IBM Ilog Script, invoking and using CP optimizer [first line is using CP;]. IBM Optimization Studio reports 1 solution, but when reviewing the variables and constraints, the values don't compute.

For example, a decision variable (dec3) equals -10, but the two decision variables (dec1 and dec2) don't add to -10 (call this constraint1). This occurs multiple times over other constraints involving other decision variables.

ct 1: dec1 + dec2 == dec3;

Yet, this is the solution I'm being provided with. There is nothing displayed in the relaxation tab. I don't get any errors that might suggest the programming language used is problematic, or any other issues.

Is this supposed to be how it works?

------------------------------
Stevie Turkington
------------------------------

Thanks for your help, Alex.

I am encountering "Opl process is not responding, you must relaunch the run configuration" an awful lot. In cmd using oplrun.exe, I think the engine is stuck at node 0 - nothing further gets displayed. I don't believe any process stops responding in the cmd instance. I give up after a while, though.

Are there equivalent settings for CP Optimizer I can set in IDE that refer to the following suggestions: here and here #2

Hi,

let me share a tiny example that works fine:

using CP;range r=1..3;{int} s={1,3};dvar int x;dvar int y in r;dvar int z in 1..3;dvar int t;subject to{  x in {1,2,3};  y==z;  t in s;}

and I shared a few OPL scripting examples at here

Thanks, I'll give that a go.

I am also trying to define particular values three variables can take on. These variables are also mentioned in the subject to area, and I'm getting plenty of 'not a range type' through to 'Operator not available for dexpr int - {string}.' messages trying the various ways to get this done (I have no clue what to do, and suggestions from ChatGPT and other posts in this forum haven't resulted in no errors appearing).

How do I go about doing this in ILOG Ilog scripting language? If there are multiple parts, where does each go (eg define parameters section, define decision variables section, subject to (constraints) section.

Hi,

can you share a small model so that other users could try ?

And just to be sure , do you get the same issue if you turn

ct 1: dec1 + dec2 == dec3;

into

 dec1 + dec2 == dec3;

?

regards

------------------------------
[Alex] [Fleischer]
[Data and AI Technical Sales]
[IBM]

Original Message:
Sent: Thu November 06, 2025 01:47 AM
From: Stevie Turkington
Subject: CP Optimizer - Solution Issue?

I have a model written in IBM Ilog Script, invoking and using CP optimizer [first line is using CP;]. IBM Optimization Studio reports 1 solution, but when reviewing the variables and constraints, the values don't compute.

For example, a decision variable (dec3) equals -10, but the two decision variables (dec1 and dec2) don't add to -10 (call this constraint1). This occurs multiple times over other constraints involving other decision variables.

ct 1: dec1 + dec2 == dec3;

Yet, this is the solution I'm being provided with. There is nothing displayed in the relaxation tab. I don't get any errors that might suggest the programming language used is problematic, or any other issues.

Is this supposed to be how it works?

------------------------------
Stevie Turkington
------------------------------

Hi,

let me share a tiny example that works fine:

using CP;range r=1..3;{int} s={1,3};dvar int x;dvar int y in r;dvar int z in 1..3;dvar int t;subject to{  x in {1,2,3};  y==z;  t in s;}

and I shared a few OPL scripting examples at here

Thanks, I'll give that a go.

I am also trying to define particular values three variables can take on. These variables are also mentioned in the subject to area, and I'm getting plenty of 'not a range type' through to 'Operator not available for dexpr int - {string}.' messages trying the various ways to get this done (I have no clue what to do, and suggestions from ChatGPT and other posts in this forum haven't resulted in no errors appearing).

How do I go about doing this in ILOG Ilog scripting language? If there are multiple parts, where does each go (eg define parameters section, define decision variables section, subject to (constraints) section.

Hi,

can you share a small model so that other users could try ?

And just to be sure , do you get the same issue if you turn

ct 1: dec1 + dec2 == dec3;

into

 dec1 + dec2 == dec3;

?

regards

------------------------------
[Alex] [Fleischer]
[Data and AI Technical Sales]
[IBM]

Original Message:
Sent: Thu November 06, 2025 01:47 AM
From: Stevie Turkington
Subject: CP Optimizer - Solution Issue?

I have a model written in IBM Ilog Script, invoking and using CP optimizer [first line is using CP;]. IBM Optimization Studio reports 1 solution, but when reviewing the variables and constraints, the values don't compute.

For example, a decision variable (dec3) equals -10, but the two decision variables (dec1 and dec2) don't add to -10 (call this constraint1). This occurs multiple times over other constraints involving other decision variables.

ct 1: dec1 + dec2 == dec3;

Yet, this is the solution I'm being provided with. There is nothing displayed in the relaxation tab. I don't get any errors that might suggest the programming language used is problematic, or any other issues.

Is this supposed to be how it works?

------------------------------
Stevie Turkington
------------------------------

Thanks for all your help so far, Alex. Really appreciated!

I'm using dexpr int for calculating various decision variables.

For example:

dexpr int c = r + 135 + (2*num1) + number12;
dexpr int d = o + 180 + number14 + number13;
dexpr int p = c - d;

From this, I've used the following both as (1) dexpr int, (2) a constraint within the subject to section and (3) sometimes both:

finalDIF = p - minusDIF

and get mixed results. finalDIF is constrained, set as a finalDIF == (value) constraint.

Sometimes the "Opl process is not responding, you must relaunch the run configuration" appears.

Sometimes I get told it equals the value, but when checking it myself it does not. I've even placed p == c - d as a constraint, removing it as a dexpr int.

At times, I'm getting strange values for p, eg 500, and minusDIF 'optimized' to be 800000. This somehow equals a positive two digit number.

What is the best way to impose constraints on variables calculated through dexpr int (eg c, d and p), the results of equations made up of decision variables?

When is it appropriate to use dexpr int vs a constraint?

Hi,

let me share a tiny example that works fine:

using CP;range r=1..3;{int} s={1,3};dvar int x;dvar int y in r;dvar int z in 1..3;dvar int t;subject to{  x in {1,2,3};  y==z;  t in s;}

and I shared a few OPL scripting examples at here

Thanks, I'll give that a go.

I am also trying to define particular values three variables can take on. These variables are also mentioned in the subject to area, and I'm getting plenty of 'not a range type' through to 'Operator not available for dexpr int - {string}.' messages trying the various ways to get this done (I have no clue what to do, and suggestions from ChatGPT and other posts in this forum haven't resulted in no errors appearing).

How do I go about doing this in ILOG Ilog scripting language? If there are multiple parts, where does each go (eg define parameters section, define decision variables section, subject to (constraints) section.

Hi,

can you share a small model so that other users could try ?

And just to be sure , do you get the same issue if you turn

ct 1: dec1 + dec2 == dec3;

into

 dec1 + dec2 == dec3;

?

regards

------------------------------
[Alex] [Fleischer]
[Data and AI Technical Sales]
[IBM]

Original Message:
Sent: Thu November 06, 2025 01:47 AM
From: Stevie Turkington
Subject: CP Optimizer - Solution Issue?

I have a model written in IBM Ilog Script, invoking and using CP optimizer [first line is using CP;]. IBM Optimization Studio reports 1 solution, but when reviewing the variables and constraints, the values don't compute.

For example, a decision variable (dec3) equals -10, but the two decision variables (dec1 and dec2) don't add to -10 (call this constraint1). This occurs multiple times over other constraints involving other decision variables.

ct 1: dec1 + dec2 == dec3;

Yet, this is the solution I'm being provided with. There is nothing displayed in the relaxation tab. I don't get any errors that might suggest the programming language used is problematic, or any other issues.

Is this supposed to be how it works?

------------------------------
Stevie Turkington
------------------------------

I have a model written in IBM Ilog Script, invoking and using CP optimizer [first line is using CP;]. IBM Optimization Studio reports 1 solution, but when reviewing the variables and constraints, the values don't compute.

For example, a decision variable (dec3) equals -10, but the two decision variables (dec1 and dec2) don't add to -10 (call this constraint1). This occurs multiple times over other constraints involving other decision variables.

ct 1: dec1 + dec2 == dec3;

Yet, this is the solution I'm being provided with. There is nothing displayed in the relaxation tab. I don't get any errors that might suggest the programming language used is problematic, or any other issues.

Is this supposed to be how it works?