GAMS World Forum

Hello everyone, I'm trying to model the constraint defined as the following piecewise function: in a model: def _function(x): condlist= [(x>=x1) & (x<x2), (x>=x2) & (x<x3), (x>=x3) & (x<=x4)] funclist= [lambda x: k1 * (x-x1) - high, lambda x: CHF_base, lambda x: k3 * (x-x3) + base] retur...

I finally found the error. COST should not be an optimization variable. In addition, the type of GEN should be "Positive". For my first experience with GAMSPy, I find that this environment is very fast in model building (little time required), which saves me quite a bit of time in executio...

Dear support team, For this small system example (demand, dispatchable generation, non dispatchable generation), I'd like to know the capacities of the different sources to satisfy the demand. In any case, the optimization should start with the existing "ex" capacities ( equation "e25...

Thank you so much ! It works perfectly.

Here is the results of your suggestion: cp1252.
I'm working on windows.
Here is the link to the code: https://github.com/Lere16/Example.git

Hello dear support team! I'm trying to build a model using GAMSpy environment. e1=Equation(container=cep, name="e1", type="regular", domain=[tech_demand], description=" variable cost for demand technology",) e1=Equation(container=cep, name="e1", type="reg...