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Now my question is, what actually does GAMS EMS solver solve, a mean-value problem? a deterministic equivalent problem? a wait-and-see problem? I am not really sure how EMS dictionary solve, especially for continuous distribution. Does EMS do sampling automatically if I call a dictionary to deal wi...

Hi, There are some smaller issues in your model (e.g. "Option emp=lindo;" should be set before your solve statement and not afterwards), but I could not reproduce that "sample" is an unknown keyword. Maybe the GAMS version you are using is too old? "Sample" as keyword w...

Gabriel, There are two problems which I found in your model: The first one is an easy one, probably just a typo: In the emp.info file you defined "randvar d2 ..." twice. I guess the second one should actually be "randvar d3 ...". The second problems seems to be deeper: You say th...

Hi GAMS Users, We would like to announce the availability of the GAMS Release 25.1.0 (Beta Version). This release contains the first public beta version of GAMS Studio - a completely new integrated development environment for GAMS. Please consult the beta release notes for details about GAMS Studio,...

... randvar d(n) discrete 0.25 70 0.5 100 0.25 130 ... Then how could I establsih a multi-randomness model? In my case, I have two variables which both obey the discrete distribution. ... Hi, First to make sure, that I understand what you want to do: You mention two variables which follow the discr...

Hi, About q1: It is correct, that .fx also sets .l (in contrast to setting .lo and .up separately). About q2: I don't know where exactly you found the things you quoted here from the documentation, but I just searched for the fx attribute and found this (https://www.gams.com/latest/docs/UG_Variables...

Hi,

Could you post your model? Then it would be easier to help.

Best regards,
Lutz

Hi,

Maybe this model from the GAMS Test Library gives you a good starting point:

https://www.gams.com/latest/testlib_ml/ ... lib01.html

Best,
Lutz

Hi,

You need to use the emp keyword "jrandvar". Here is an example where this is used:

https://www.gams.com/latest/emplib_ml/l ... joint.html

More general information can be found here:

https://www.gams.com/24.9/docs/UG_EMP_SP.html

I hope that helps,
Lutz

Hi, One way to do this, is using the "mod" function together with the "ord" operator: set t hours of a year /t1*t8760/; * Init everything to 5 parameter P_el(t) electricity price /#t 5/; * Set peak hours to 10 P_el(t)$(mod(ord(t),24)>=7 and mod(ord(t),24)<=18 ) = 10; If you need ...