Re: [Help-glpk] Numerical instability warning

[Andrew Makhorin]

On Mon, 2011-03-07 at 10:37 -0500, GLENN RHOADS wrote:
> On Sun, 06 Mar 2011 02:00:12 +0300
>  Andrew Makhorin <address@hidden> wrote:
> > Note that you can use the routine glp_check_kkt to check
> > if the solution satisfies to the feasibility/optimality conditions.
> 
> I tried calling lpx_check_kkt() but I'm getting a segmentation fault
> generated from within this routine.  I do the following,
> 
> LPXKKT *kkt    // variable declaration
> lpx_check_kkt( lp, 1, kkt );
> 
> I get a segmentation fault in _glp_lpx_check_kkt() at the line
> 649    kkt->pe_ae_row = ae_ind;
> 
> because the variable kkt is null (0x0)
> 
> The manual simply says "The parameter kkt is a pointer to the structure
> LPXKKT, to which the routine stores the results of the check."
> 
> I was assuming that this structure is generated by the routine and that
> the passed in pointer gets set to it.  Do I need to call something that
> sets this kkt pointer to the LPXKKT structure?  What's wrong?
> 
> -- Glenn
> 
> 
> 

Correct code is the following:

LPXKKT kkt;    // variable declaration
lpx_check_kkt( lp, 1, &kkt );