Re: [Help-glpk] Why some answers missed

[Andrew Makhorin]

> I used a C program to form a gmpl program to solve my problem,for it
> has a huge number of variables.But some of the answers were missed,for
> example(I copied a part of the answers)
>   3851 wx[w1]       B             -2                             
>   3852 wx[w2]       B             -2                             
>   3853 wx[w3]       B             -2                             
>   3854 wx[w4]       B             -2                             
>   3855 wx[w5]       B             -2                             
>   3856 wx[w6]       B             -2                             
>   3857 wx[w14]      B             -2                             
>   3858 wx[w19]      B             -2                             
>   3859 wx[w21]      B              0                             

> In this case,w7-w13 and w15-w18 were missed.How did it happen? And I
> want to use these answers in another program,so I wonder if the
> answers had been stored in arrays or anything that I can read
> directly(not read the answers form a output file)

Elemental variables wx[w7], wx[8], etc. do not appear in any
constraint, so the mathprog translator does not generate them.
From the formal point of view such variables may have any value in
optimal solution.