Re: [Help-glpk] confusion on constraints

[arun gaikwad]

--- address@hidden wrote:
> How does one attempt to add a constraint which does
> not involve every 
> structural variable (i.e. x[m+1]...x[m+n]) using
> lpx_load_matrix?  It 
> would seem that if I had three structural variables
> (x1, x2, x3) and a 
> constraint of the form x1 + x2 = 4, that I would
> have the following
> 
> ia[1] = 1, ja[1] = 1, ar[1] = 1.0;
> ia[2] = 1, ja[2] = 2, ar[2] = 1.0;
> ia[3] = 1, ja[3] = 3, ar[3] = 0.0;
> 
> but, I receive the following run-time error if I
> attempt to do this:
> 
> lpx_load_matrix: ar[1] = 0; zero element not allowed
> 
> 
> Don
> 
> [Please reply to me as well as the list.  I am not
> subscribed to the 
> list.]>
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You are  supposed to add ONLY non-zero array elements.
ia[1] = 1, ja[1] = 1, ar[1] = 1.0;
ia[2] = 1, ja[2] = 2, ar[2] = 1.0;
and 
lpx_load_matrix(2,...)