Hi all,

I am still new to CPLEX. I have got my model running and got the feasible solutions from the model.

However, when I ex-post calculate the value from the variable (as below), I ran into the warning message of "Element has never been used". I simply want to sum over the solution of the variable (NEWSTOCK) into the parameters (EndNewstock) and cross check the number with the actual data.
This statement is added after the minimize statement and the constraints statement.

As warning message indicated, even though I got the solutions for decision variable NEWSTOCK, EndNewstock is not created nor has any value showed in the "problem browser" tab.

float EndNewstock[ti in t][v in vehicle][s in segment]=sum(a in agev, vmt in vmtgrp) NEWSTOCK[ti][v][a][vmt][s];​

execute{writeln(EndNewstock);}​

the warning you got should go away.
Lazy evaluation means values are computed only if needed.

int a;

will also generate a warning if you do not use a later on

Hi all,

I am still new to CPLEX. I have got my model running and got the feasible solutions from the model.

However, when I ex-post calculate the value from the variable (as below), I ran into the warning message of "Element has never been used". I simply want to sum over the solution of the variable (NEWSTOCK) into the parameters (EndNewstock) and cross check the number with the actual data.
This statement is added after the minimize statement and the constraints statement.

As warning message indicated, even though I got the solutions for decision variable NEWSTOCK, EndNewstock is not created nor has any value showed in the "problem browser" tab.

float EndNewstock[ti in t][v in vehicle][s in segment]=sum(a in agev, vmt in vmtgrp) NEWSTOCK[ti][v][a][vmt][s];​

execute{writeln(EndNewstock);}​

the warning you got should go away.
Lazy evaluation means values are computed only if needed.

int a;

will also generate a warning if you do not use a later on

Hi all,

I am still new to CPLEX. I have got my model running and got the feasible solutions from the model.

However, when I ex-post calculate the value from the variable (as below), I ran into the warning message of "Element has never been used". I simply want to sum over the solution of the variable (NEWSTOCK) into the parameters (EndNewstock) and cross check the number with the actual data.
This statement is added after the minimize statement and the constraints statement.

As warning message indicated, even though I got the solutions for decision variable NEWSTOCK, EndNewstock is not created nor has any value showed in the "problem browser" tab.

float EndNewstock[ti in t][v in vehicle][s in segment]=sum(a in agev, vmt in vmtgrp) NEWSTOCK[ti][v][a][vmt][s];​

execute{writeln(EndNewstock);}​

the warning you got should go away.
Lazy evaluation means values are computed only if needed.

int a;

will also generate a warning if you do not use a later on

Hi all,

I am still new to CPLEX. I have got my model running and got the feasible solutions from the model.

However, when I ex-post calculate the value from the variable (as below), I ran into the warning message of "Element has never been used". I simply want to sum over the solution of the variable (NEWSTOCK) into the parameters (EndNewstock) and cross check the number with the actual data.
This statement is added after the minimize statement and the constraints statement.

As warning message indicated, even though I got the solutions for decision variable NEWSTOCK, EndNewstock is not created nor has any value showed in the "problem browser" tab.

float EndNewstock[ti in t][v in vehicle][s in segment]=sum(a in agev, vmt in vmtgrp) NEWSTOCK[ti][v][a][vmt][s];​