Re: [Help-glpk] power of: calculate 2^x from variable x

[Andrew Makhorin]

> # multiply the c-th cell of the temporary row with 2^c
> s.t. c4{r in R}: s[r] = sum{c in C} (2 ** c) * t[r,c];
> 

If c is large (say, greater than 10), using this formulation
may cause numerical difficulties like in case of too "big M".
You might try to choose some other, more suitable parametrization 
of the solution space.