Hi,
If I run the code for one of the data-sets again, I could run it
successfully.
However, this is random. error still occurs for 2-3 datasets.
For iteration limit, I am calculating average of all simplex iterations
(gamma_avg) required to solve the LP
at each node. I calculate this as follows. I also use gamma_avg =
abs(gamma_avg) in the end.
For calculating LP relaxations at child nodes, I use iterations limit as
(2*gamma_avg).
This value is becoming negative somewhere. This occurs only for 2 to 3
datasets out of 20.
***********************************************************
variable declaration (global):
static int mynodeindex = 0,tot_it_count=0,num_node=0,gamma_avg=500;
***********************************************
Calculating average simplex iterations in callback routine:
case GLP_IBRANCH:
iter_count = lpx_get_int_parm(glp_ios_get_prob(tree), LPX_K_ITCNT);
if(iter_count > 0)
{
num_node = num_node+1;
tot_it_count = tot_it_count + iter_count;
tempitlim = tot_it_count / num_node;
gamma_avg = (int)tempitlim;
}
gamma_avg = abs(gamma_avg);
************************************************
Use 2*gamma_avg as iteration limit.
glp_init_smcp(&simplexparm2);
simplexparm2.it_lim = 2*gamma_avg;
Let me know if I am wrong somewhere.
Thanks,
Sheetal
On Sat, Jan 14, 2012 at 8:02 AM, glpk xypron <[email protected]> wrote:
> Hello Sheetal,
>
> please, subscribe to the help list. Otherwise your mails have
> to be forwarded manually.
> https://lists.gnu.org/mailman/listinfo/help-glpk
>
> How can your problem be reproduced?
>
> Best regards
>
> Xypron
>
> > -------- Forwarded Message --------
> > From: sheetal murkute <[email protected]>
> > To: [email protected], Andrew Makhorin <[email protected]>
> > Subject: Re: Error - negative iteration limit
> > Date: Fri, 13 Jan 2012 15:51:56 -0500
> >
> > Furthermore, I have displayed last few lines in the log file below when
> > I get negative iteration limit error.
> >
> > +184153: mip = 2.075400000e+05 >= 2.025778983e+05 2.4% (16051;
> > 2956)
> > +184223: mip = 2.075400000e+05 >= 2.025778983e+05 2.4% (16055;
> > 2961)
> > +184309: mip = 2.075400000e+05 >= 2.025778983e+05 2.4% (16059;
> > 2966)
> > +184390: mip = 2.075400000e+05 >= 2.025778983e+05 2.4% (16066;
> > 2968)
> > +184492: mip = 2.075400000e+05 >= 2.025778983e+05 2.4% (16066;
> > 2974)
> > +184594: mip = 2.075400000e+05 >= 2.025778983e+05 2.4% (16068;
> > 2978)
> > Time used: 12257.2 secs. Memory used: 103.7 Mb.
> > +184671: mip = 2.075400000e+05 >= 2.025778983e+05 2.4% (16069;
> > 2983)
> > +184741: mip = 2.075400000e+05 >= 2.025778983e+05 2.4% (16072;
> > 2985)
> > +184822: mip = 2.075400000e+05 >= 2.025778983e+05 2.4% (16075;
> > 2990)
> > +184918: mip = 2.075400000e+05 >= 2.025778983e+05 2.4% (16078;
> > 2995)
> > +185113: mip = 2.075400000e+05 >= 2.027808401e+05 2.3% (16080;
> > 3008)
> > +185364: mip = 2.075400000e+05 >= 2.027808401e+05 2.3% (16093;
> > 3022)
> > glp_simplex: it_lim = -188940; invalid parameter
> > Error detected in file glpapi06.c at line 403
> >
> >
> >
> > On Fri, Jan 13, 2012 at 3:49 PM, sheetal murkute <[email protected]>
> > wrote:
> > Hi,
> >
> >
> > I have implemented strong branching for 20 datasets. For three
> > of these datasets,
> > My code gets terminated with error.
> > The message displayed in the log file is as follows.
> >
> >
> > glp_simplex: it_lim = -188940; invalid parameter
> > Error detected in file glpapi06.c at line 403
> >
> >
> > I have given iteration limit for calculating LP relaxation of
> > the child nodes. I have set this limit to positive value only.
> > I have not provided any simplex iteration limit elsewhere.
> >
> > Can you please guide where this garbage negative value can come
> > from?
> >
> >
> >
> >
> >
> >
> > --
> > Thanks with Best Regards,
> > Sheetal
> >
> >
> >
> >
> >
> >
> > --
> > Thanks with Best Regards,
> > Sheetal
> >
>
> --
> Follow me at http://twitter.com/#!/xypron
>
> NEU: FreePhone - 0ct/min Handyspartarif mit Geld-zurück-Garantie!
> Jetzt informieren: http://www.gmx.net/de/go/freephone
>
--
Thanks with Best Regards,
Sheetal
:)
_______________________________________________
Help-glpk mailing list
[email protected]
https://lists.gnu.org/mailman/listinfo/help-glpk
