You may try something like:
param bigM := sum{i in X, k in X} cumdemand[i,k] + sum{j in X} demand[j];
greetz
Christian
franzl schrieb:
> Hi there!
>
> I just got started with ampl and i have to use "bigM" as in:
>
> cumdemand[i,k] + demand[j] - cumdemand[j,k] <= (1 - x[i,j,k]) * bigM;
>
> but how can i implement this without using a numerical value for bigM?
>
> thx for your help
>
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