GAMS World Forum

Hi, I would like to define a variable on a set that varies based on another set: x is my variable that depends on the generator g and on the discretization index q: x(g,q) q takes values from 1 to n, where n is based on the generator g considered. For example: 2 generators: set G /A,B/; For generato...

The method (if<0.1, set binary to 0) works because 1.386...e-8 is equal to 0.00000001 and hence <0.1 but round is still correct because the nearest integer value is 0. Your suggestion for the iterative model works perfectly!!! Thanks again, I couldn't have pulled this off without you. Martina

I’m using an if statement that sets all those binaries to 0 if are <0.1 but I can try with your method ☺️ May I ask a closely related question? Are there instructions for change the declaration of a variable into a parameter? I want to solve a problem itaratively, where I have the bilinear term a*b:...

Thank you Michael. Yes, there is more: I have a 2 stages model. After step 1 (first resolution of the MIP), I want to fix the values of some continuous variables (the variables of the first stage) and the values of all the binaries to the optimal values obtained in Step 1 in order to ask for the ext...

Hi everyone, How can I arrange the GAMS code in order to do the following step? 1. Solve MIP problem 2. Fix binaries to the values obtained in 1. 3. Solve LP problem With the binary variable alfa, I tried this solve Model using MIP minimizing z; loop ((k,time), alfa.fx(k,time)=alfa.l(k,time) ; ); so...

Hi Michael,
many thanks for the reply.

I saw that in the reshuffle you didn't write year. How can I deal with values for multiple years? so for example if the set of years contains 2017 and 2018

Hi Michael I am still having problems with csv, please bear with me... I followed a lot of examples but I can’t import a multidimension parameter (3 dim) defined in the following CSV FUEL_PRICE-Stoc 2.csv The code is the following Table fuel_price(year,fuel,scen); $call csv2gdx "/Users/martinag...

Many thanks Bussieck to reply,

there is an alternative for working only with mac?
I saw that it is possible to work with CSV but I did not find any example for exporting results

Hi,

How can I write my GAMS result using a mac?

For the import of the data, I create GDX files with Windows but for saving the results I don't know how to do it.
The command
execute 'gdxxrw.exe result.gdx o=result.xlsx par=result'
doesn't work.

Thank you in advance

Yes
I only have this old version of GUROBI and I didn't know about the recent update of GUROBI.
Since i can't use the solver, I have to linearize the bilinear terms

Thank you anyway for your help!