Search found 41 matches
- 1 year ago
- Forum: Syntax
- Topic: How to explicitly mention equations of .inc file in the model description
- Replies: 1
- Views: 2205
How to explicitly mention equations of .inc file in the model description
Hi, I have been using the 'pwlfunc.inc' for my work. However, I have hundreds of equations among which I want to exclude some and include some at times. When I was looking at the example where the 'pwlfunc.inc' was used: https://www.gams.com/latest/gamslib_ml/libhtml/gamslib_bidpwl.html I have notic...
- 1 year ago
- Forum: Modeling
- Topic: Difficulty in understanding the sample code on Bid Evaluation
- Replies: 2
- Views: 1186
Re: Difficulty in understanding the sample code on Bid Evaluation
Hi, Thanks a lot for your reply. I think that I have understood it to some extent. But I do have one additional question. If I want to consider the demand varying with the time so does the quantity and cost will be dependent on time. So, the 'req' will turn into 'req(t)' and so do the 'x(v) and y(v)...
- 1 year ago
- Forum: Modeling
- Topic: Difficulty in understanding the sample code on Bid Evaluation
- Replies: 2
- Views: 1186
Difficulty in understanding the sample code on Bid Evaluation
Hi, I have been trying to understand the code for bid evaluation in :https://www.gams.com/latest/gamslib_ml/libhtml/gamslib_bidpwl.html As per my understanding goes the x(v) is a variable that represents the quantity each vendor bids for whereas in equation defy(v) the corresponding cost has been ca...
- 1 year ago
- Forum: Syntax
- Topic: Running problem with the piecewise linear example code in the GAMS portal
- Replies: 2
- Views: 1717
Re: Running problem with the piecewise linear example code in the GAMS portal
Hi, I have figured out the cause perhaps. The pwlfunc.inc file was not found while executing the code, however when I changed to the .inc filename with its address then it works. Perhaps GAMS was not added to my environment variable path. Anyway, thanks a lot. At the beginning I thought that the pwl...
- 1 year ago
- Forum: Syntax
- Topic: Running problem with the piecewise linear example code in the GAMS portal
- Replies: 2
- Views: 1717
Running problem with the piecewise linear example code in the GAMS portal
Hi, I have been trying to execute the code given at :https://www.gams.com/latest/gamslib_ml/libhtml/gamslib_bidpwl.html But I am getting this error message: image.png I have these lines in my pwlfunc.inc file: BidPwl s x y l g v loop(BidPwl_Seg(v,s)$(ord(s) > 2), BidPwl(v,s,'y') = BidPwl(v,s-1,'y') ...
- 1 year ago
- Forum: Solvers
- Topic: Parallel Mode and Number of Threads Setting in cplex.opt file
- Replies: 3
- Views: 3069
Re: Parallel Mode and Number of Threads Setting in cplex.opt file
Yes, I did.
I have done the following in my .gms file.
MyModel.iterlim =500000;
MyModel.optcr = 0.001;
MyModel.reslim = 1800;
option solvelink=5;
MyModel.optfile = 1;
heaplimit = 30000;
And I have tried to specify the thread number there as well like the following:
MyModel.threads=0;
I have done the following in my .gms file.
MyModel.iterlim =500000;
MyModel.optcr = 0.001;
MyModel.reslim = 1800;
option solvelink=5;
MyModel.optfile = 1;
heaplimit = 30000;
And I have tried to specify the thread number there as well like the following:
MyModel.threads=0;
- 1 year ago
- Forum: Solvers
- Topic: Parallel Mode and Number of Threads Setting in cplex.opt file
- Replies: 3
- Views: 3069
Parallel Mode and Number of Threads Setting in cplex.opt file
Hi,
I have set,
threads=0
and
parallelmode=-1
in the cplex.opt file ; but while executing the logfile is not showing up those values. Can anyone tell me how to define them correctly?
Best Regards.
I have set,
threads=0
and
parallelmode=-1
in the cplex.opt file ; but while executing the logfile is not showing up those values. Can anyone tell me how to define them correctly?
Best Regards.
- 1 year ago
- Forum: Modeling
- Topic: How to hold a constant variable value consecutively?
- Replies: 1
- Views: 1443
How to hold a constant variable value consecutively?
I have been trying to model a constraint for a variable in an MIP formulation. My problem is like this; X(t) is a variable, whose value has to remain constant for some pre-defined consecutive periods after its value decreases. So, say at t=2, the X(t=2) value decreases from X(t=1), then X(t) should ...
- 1 year ago
- Forum: Modeling
- Topic: Approach for handling non-linear equations
- Replies: 1
- Views: 1998
Approach for handling non-linear equations
Hi, One of my constraints involves formulating this relationship between two variables x and y as shown in this picture: image.png Since this is a non-linear relationship, it becomes difficult to solve the problem. From my past experience, it is really difficult to get a solution for a non-linear pr...
- 2 years ago
- Forum: Syntax
- Topic: Command line Keyword in the gams script
- Replies: 4
- Views: 4886
Command line Keyword in the gams script
Hi, What is the correct syntax of including the command line keyword in the code? For example, I am executing this command >gams mycode keep=1 --USE_GAMS='YES' So, how should I write the 'keep=1 --USE_GAMS='YES' ' in the syntax of the .gms file instead of writing each time in the command line. My ot...