Set multiplication

Problems with syntax of GAMS
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Hussain_TUT
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Set multiplication

Post by Hussain_TUT » 4 months ago

Hello,

I am working in a model that produce one batch of a chemical process that has many sub-processes. The batch horizon is 700 time intervals. During the process, one process begin for short duration (10-50 interval) who beginning time and total duration is calculated by the optimization itself. The sub-process rate of reaction follows a trajectory that is saved in a parameter of size 50 interval (less than batch horizon). Now when this process activated, it should take the first value saved in the parameter rate(t1) and so on. I am using MIP programming where a binary variable sb_i(t) is used to indicate the beginning of the sub process. The constraint look like

set t /1*700/
set t1 /1*50/;
Parameter
rate(t1);
rate(t1)= (some different value)
;
Variable
sb_i(t);
Process_constraint(t);

process_constraint(t).. prcoess_mass(t)=E=process_mass(t-1)-[rate(t1)]*sb1(t);

But i think, direct way is not working due to vector different dimensions. So anybody has any idea how to proceed with such multiplication?

Thanks :)

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bussieck
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Re: Set multiplication

Post by bussieck » 2 months ago

I really did not get what you try to accomplish here. Write your model in mathematical notation and then the translation to GAMS is easy.

-Michael

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