> First of all, excuse my bad english. Im new at mathprog and trying to
> model some problem i get as output some strange thing:
>
> No. Row name Activity Lower bound Upper bound
> ------ ------------ ------------- ------------- -------------
> .....
> .....
>
> 7 constraint[1]
> 0 -0
> 8 constraint[2]
> 0 -0
> 9 constraint[3]
> -3 -0
> 10 constraint[4]
> -2 -0
>
> I dont get why those values happen at this constraint, because neither
> of the variables or values are negative in the first place. The
> constraint is defined as follow:
>
> s.t. constraint{j in 1..n}: sum{i in 1..m} d[i,j] <= m * y[j];
>
> Where m is a param defined in the data, positive integer, y is a
> binary variable and d[i,j] are real variables between 0 and 1
> (0<=d<=1)
>
> Any help would be greatly appreciated!! thanks in advance