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### Define restriction in a variable

Posted: Sun May 14, 2017 5:59 pm
Hello,
Could i put a restriction in a variable, depending the valor of the same variable?
I try to put:

Code: Select all

``````Binary Variable: x(i,k)
R(i,k)..    x(i,k)\$(x(i,k) eq 1) =g= x(i,k+1);``````
But this code doesn't work. How can i do something like before?
I want that if x(1,1)=1 =>x(1,2)=1 or 0 but if x(1,1)=0=> x(1,2)=1 or 0. (Because if a put x(i,k)=g=x(i,k+1) always x(1,1) will be 1 and i don't want.)

Best Regards

### Re: Define restriction in a variable

Posted: Mon May 15, 2017 5:30 pm
Hola Eduardo.

What you are trying to accomplish is called disjunctive programming and is non trivial. Besides the theory to write that kind of constraints "on your own", there are some pre built solutions in GAMS. Checkout EMP:https://www.gams.com/latest/docs/usergu ... 1_2_3_0_13 and LogMIP: http://www.logmip.ceride.gov.ar/

### Re: Define restriction in a variable

Posted: Tue May 23, 2017 7:59 pm