Re: [Help-glpk] Linear program - Difficulty expressing a constraint

[Oscar Gustafsson]

Use n additional binary variables, z_i, and impose constraints as shown on 
the scip-list (binary variable non-zero if continuous variable non-zero).

x_i <= M*z_i;

where M is the largest possible value for x_i

Then add constraint

sum z_i <= n-1;

Regards

Oscar