Re: [Help-glpk] var between 2 parameters

[Andrew Makhorin]

> I'm working on scheduling model which consider the day-off in the allocation.
> I need your help because I need to model a constraint as the following:
> 
> var x, y;
> param a,b;
> 
> if (x > param a) and (x < param b) then
>     y = 1;
> else
>     y = 0;
> end if;
> 
> do you think is feasible?
> Thanks in advance for your help.
> 

x >= a - M1 * (y - 1)
x <= b + M2 * (y - 1)

where y is a binary variable, M1 and M2 are "big M's" that should be
chosen as small as possible.