Hi,

I would like to progressively build up certain constraints in Java API. I aim to add certain values into IloNumExpr per each origin-destination pair.

HashMap<OriginDestionation,IloNumExpr> tracker = new HashMap<OriginDestionation,IloNumExpr>();

Suppose I create

IloNumExpr expr= ...; 
OriginDestionation instance= ...; 

and add to my map as follows 

tracker.put(instance, expr);

Now, I would like to add another IloNumExpr term by using the "instance" key in another part of my code. I have tried to do the following but received an error. 

IloNumExpr tempExpr = tracker.get(instance);
tempExpr.addTerm(x, y); //x and y are double and IloIntVar, respectively. 
tracker.put(instance, tempExpr);


Error message is "The method addTerm(double, IloIntVar) is undefined for the type IloNumExpr"
------------------------------
Ser Giovio
------------------------------
#DecisionOptimization

I guess you should create and store IloLinearNumExpr objects which are created from cplex.linearNumExpr() ?

------------------------------
Vincent Beraudier
------------------------------

Original Message:
Sent: Tue May 18, 2021 01:35 AM
From: Ser Giovio
Subject: How to add two IloLinearNumExpr terms in Java

Hi,

I would like to progressively build up certain constraints in Java API. I aim to add certain values into IloNumExpr per each origin-destination pair.

HashMap<OriginDestionation,IloNumExpr> tracker = new HashMap<OriginDestionation,IloNumExpr>();

Suppose I create

IloNumExpr expr= ...; 
OriginDestionation instance= ...; 

and add to my map as follows 

tracker.put(instance, expr);

Now, I would like to add another IloNumExpr term by using the "instance" key in another part of my code. I have tried to do the following but received an error. 

IloNumExpr tempExpr = tracker.get(instance);
tempExpr.addTerm(x, y); //x and y are double and IloIntVar, respectively. 
tracker.put(instance, tempExpr);


Error message is "The method addTerm(double, IloIntVar) is undefined for the type IloNumExpr"
------------------------------
Ser Giovio
------------------------------
#DecisionOptimization

Thanks! I did actually figure it out myself after posting the question, but could not find a way to delete the post. Aren't we allowed to delete our posts which have not been answered? 🤔

------------------------------
Ser Giovio
------------------------------

Original Message:
Sent: Tue May 18, 2021 03:37 AM
From: Vincent Beraudier
Subject: How to add two IloLinearNumExpr terms in Java

I guess you should create and store IloLinearNumExpr objects which are created from cplex.linearNumExpr() ?

------------------------------
Vincent Beraudier

Original Message:
Sent: Tue May 18, 2021 01:35 AM
From: Ser Giovio
Subject: How to add two IloLinearNumExpr terms in Java

Hi,

I would like to progressively build up certain constraints in Java API. I aim to add certain values into IloNumExpr per each origin-destination pair.

HashMap<OriginDestionation,IloNumExpr> tracker = new HashMap<OriginDestionation,IloNumExpr>();

Suppose I create

IloNumExpr expr= ...; 
OriginDestionation instance= ...; 

and add to my map as follows 

tracker.put(instance, expr);

Now, I would like to add another IloNumExpr term by using the "instance" key in another part of my code. I have tried to do the following but received an error. 

IloNumExpr tempExpr = tracker.get(instance);
tempExpr.addTerm(x, y); //x and y are double and IloIntVar, respectively. 
tracker.put(instance, tempExpr);


Error message is "The method addTerm(double, IloIntVar) is undefined for the type IloNumExpr"
------------------------------
Ser Giovio
------------------------------
#DecisionOptimization