combination matrix generation (paramters)

[Bernie Lindner]

Hi There

I am wondering if there's an easy way to do the following:

I have a model up and running (MIP) with 8 prodcuts. however I want to look at different cases for the coefficient values infront of the 8 binary variables (i.e. different parameter values).

Say now these values may range from 1 to 100. I would like to generate a matrix (see attached image), with all combinations of the different values (e.g. 0,25,50,75,100)

I was wondering if there's an easy way to generate such a matrix. Only way I can think is to write code in MainExecution with for loops for the cases and products.

Bernie

[Guido Diepen]

Hi Bernie,

multiple possibilities. You can indeed use a procedure to create the values for a multi-dimensional parameter. It appears that the values of that matrix have a lot of structure (i.e. you can determine what the different values for the products would be based on the case number). Another possibility you have is to create a parameter with a definition based on this structure. The big advantage of using a definition is that AIMMS will ensure that the values are always up-to-date whenever you access them.

Guido Diepen

AIMMS Specialist