Search found 247 matches

by Fred
2 weeks ago
Forum: Solvers
Topic: Parallel processing with CPLEX
Replies: 3
Views: 210

Re: Parallel processing with CPLEX

Where have you heard that CPLEX can use GPUs? I think that is plain wrong.
It can use multiple cores/threads though. In GAMS you can set the number of threads via option threads.

I hope this helps!

Fred
by Fred
3 weeks ago
Forum: Modeling
Topic: Integer Infeasible Soluiton
Replies: 1
Views: 182

Re: Integer Infeasible Soluiton

Hi, When posting code code, please use the code tags. The code tags are inserted if you click on the symbol with "<\>". Otherwise the formatting (e.g. of tables) gets destroyed when copy/pasting code. For your model even the RMIP (the LP you get when neglecting integrality requirements for discrete ...
by Fred
3 months ago
Forum: Syntax
Topic: error 66 and 256
Replies: 2
Views: 532

Re: error 66 and 256

Hi, When you look into the lst file, you will find the following error message: 66 solve data_envelopment using lp minimizing M; **** $66,256 **** 66 The symbol shown has not been defined or assigned **** A wild shot: You may have spurious commas in the explanatory **** text of a declaration. Check ...
by Fred
3 months ago
Forum: Solvers
Topic: CPLEX OPTCR
Replies: 2
Views: 589

Re: CPLEX OPTCR

Hi,

When you set

Code: Select all

OPTIONS OPTCR=0.05;
Cplex should terminate as soon as that gap is reached.
Could you share a log and your code?

Fred
by Fred
3 months ago
Forum: Syntax
Topic: csv2gdx creates <empty> rows when trying to read in set
Replies: 6
Views: 683

Re: csv2gdx creates <empty> rows when trying to read in set

Hi, You read text1 as a 5-dimensional set. Hence, given the structure of the data in the csv file, it is expected that the domain sets Dim1,...,Dim5 contain the empty element. If you need to read the sets separately, the only way to do this with csv2gdx is to put them in different csv file. You coul...
by Fred
4 months ago
Forum: Bugs
Topic: MSNLP solver "stops" before running the algorithm
Replies: 3
Views: 2261

Re: MSNLP solver "stops" before running the algorithm

Can you share the source file moi.gms?

Fred
by Fred
4 months ago
Forum: Modeling
Topic: Infeasibility & entries skipped
Replies: 3
Views: 469

Re: Infeasibility & entries skipped

There is no problem. It is usual that the initial point is not feasible. Look for example at the trnsport model. The equation listing shows ---- demand =G= satisfy demand at market j demand(new-york).. x(seattle,new-york) + x(san-diego,new-york) =G= 325 ; (LHS = 0, INFES = 325 ****) demand(chicago)....
by Fred
4 months ago
Forum: Syntax
Topic: Sum over all observations except the observation under investigation
Replies: 2
Views: 586

Re: Sum over all observations except the observation under investigation

Hi Teo,

You could use a dollar condition as follows

Code: Select all

out(i,outp).. sum(ii$(not sameas(i,ii)),lm(i,ii)*y(outp,ii))=E=y(outp,i)*(1+beta1(i));
I hope this helps!

Fred
by Fred
4 months ago
Forum: Modeling
Topic: Infeasibility & entries skipped
Replies: 3
Views: 469

Re: Infeasibility & entries skipped

Hi, You are referring to the equation listing which provides information about the generated model before it is solved. Infes=... indicates that the equation is infeasible for the given start point (i.e. based on the current levels of variables when the model is generated). "remaining ... entries sk...
by Fred
4 months ago
Forum: Solvers
Topic: Codes runs fine but stops halfway
Replies: 6
Views: 896

Re: Codes runs fine but stops halfway

The screenshot indicates that the job was not yet completed. Otherwise you would see

Code: Select all

*** Status: Normal completion
in the log (or some error message if there are any issues).
Can you please share the full log file?

Best,
Fred