Search found 21 matches

by Luca
2 months ago
Forum: Syntax
Topic: Matrix multiplication in GAMS
Replies: 1
Views: 131

Matrix multiplication in GAMS

Dear all,

what is the best way to multiply two matrix in GAMS?

Thanks for all your answer,
Luca
by Luca
2 months ago
Forum: Syntax
Topic: GAMS CPU time
Replies: 4
Views: 198

Re: GAMS CPU time

usually I test code with single thread and I report this CPU time.
otherwise what you suggest to do ?

Thanks,
Luca
by Luca
2 months ago
Forum: Syntax
Topic: GAMS CPU time
Replies: 4
Views: 198

GAMS CPU time

Dear all,

I know in gams the elapsed time can be retrive by the couple of instructions:

scalar starttime; starttime = jnow;
....
scalar elapsed; elapsed = (jnow - starttime)*24*3600; display elapsed;

but how can i retrive the cpu time spent in gams by my code?

Thanks in advance,
Luca
by Luca
2 months ago
Forum: Tools
Topic: Gams and eigenvectors
Replies: 2
Views: 168

Re: Gams and eigenvectors

thanks very much. I will do the exercise
by Luca
2 months ago
Forum: Tools
Topic: Gams and eigenvectors
Replies: 2
Views: 168

Gams and eigenvectors

Dear all,

I am using the tool eigenvector.exe to compute the eigenvector of a matrix.
Gams return a matrix with the eigenvectors. Just one question: the eigenvector are the row or the column of that matrix?

Thanks very much. Best regards,
Luca
by Luca
5 months ago
Forum: Solvers
Topic: Infeasibilities in CPLEX
Replies: 2
Views: 2410

Re: Infeasibilities in CPLEX

Thanks very much for your help!

Luca
by Luca
5 months ago
Forum: Solvers
Topic: Infeasibilities in CPLEX
Replies: 2
Views: 2410

Infeasibilities in CPLEX

Dear all, I am programming in GAMS using CPLEX as MIP solver. I activated the following options for CPLEX feasopt 1 numericalemphasis 1 scaind 1 CPLEX should provide the "less infeasible" solution to the problem. However I obtain the following error: Feasible solution. ------------------------------...
by Luca
6 months ago
Forum: Modeling
Topic: Principal component analysis in GAMS
Replies: 1
Views: 1525

Principal component analysis in GAMS

Dear all,
I would like to implement principal component analysis in GAMS. I would ask you if there are linear algebra facilities in GAMS (such as tools to compute eigenvalues...) or there are libraries already available for PCA in GAMS.

Thanks very much for your help. Best regards,
Luca
by Luca
6 months ago
Forum: Syntax
Topic: Excel printing problem
Replies: 3
Views: 1228

Re: Excel printing problem

Thanks very much. Now it works.
Best regards,
Luca
by Luca
6 months ago
Forum: Syntax
Topic: Excel printing problem
Replies: 3
Views: 1228

Excel printing problem

Dear all users,

I am using GAMS to solve an optimisation problem and I am printing the results to an excel sheet. I wold ask you if there is a way to print in excel all the entries of a variable included the zero entries.

Thanks in advance. Best regards,
Luca