Hi GAMS wolrd,
When I used SCIP solver to process my model, which is MINLP and consists of a lot of discrete variables, the solver came up with optimal solution but indicated ‘solving was interrupted [gap limit reached]’. What does it mean?
Thanks,
Dylan
–
To unsubscribe from this group and stop receiving emails from it, send an email to gamsworld+unsubscribe@googlegroups.com.
To post to this group, send email to gamsworld@googlegroups.com.
Visit this group at http://groups.google.com/group/gamsworld.
For more options, visit https://groups.google.com/groups/opt_out.
Hi,
It means that SCIP has stopped the solving process when it reached the gap limit (optcr).
http://support.gams.com/doku.php?id=solver:what_is_optca_optcr
That is, it has found a feasible solution but did not finish proving optimality. If you run with default optcr, it means that it could prove that the solution found is at most 10% worse (w.r.t. objective value) than an optimal one.
Hope that helps,
Stefan
On Monday, September 9, 2013 9:53:59 AM UTC+2, Dylan Lan wrote:
Hi GAMS wolrd,
When I used SCIP solver to process my model, which is MINLP and consists of a lot of discrete variables, the solver came up with optimal solution but indicated ‘solving was interrupted [gap limit reached]’. What does it mean?
Thanks,
Dylan
–
To unsubscribe from this group and stop receiving emails from it, send an email to gamsworld+unsubscribe@googlegroups.com.
To post to this group, send email to gamsworld@googlegroups.com.
Visit this group at http://groups.google.com/group/gamsworld.
For more options, visit https://groups.google.com/groups/opt_out.
Hi Stefan,
Thank you very much, it is very helpful.
By the way, is it possible for us to change the optcr?
Thanks,
Dylan
在 2013å¹´9月10日星期二UTC+8下åˆ4æ—¶30分55秒，Stefan Vigerske写é“：
Hi,
It means that SCIP has stopped the solving process when it reached the gap limit (optcr).
http://support.gams.com/doku.php?id=solver:what_is_optca_optcr
That is, it has found a feasible solution but did not finish proving optimality. If you run with default optcr, it means that it could prove that the solution found is at most 10% worse (w.r.t. objective value) than an optimal one.
Hope that helps,
Stefan
On Monday, September 9, 2013 9:53:59 AM UTC+2, Dylan Lan wrote:
Hi GAMS wolrd,
When I used SCIP solver to process my model, which is MINLP and consists of a lot of discrete variables, the solver came up with optimal solution but indicated ‘solving was interrupted [gap limit reached]’. What does it mean?
Thanks,
Dylan
–
To unsubscribe from this group and stop receiving emails from it, send an email to gamsworld+unsubscribe@googlegroups.com.
To post to this group, send email to gamsworld@googlegroups.com.
Visit this group at http://groups.google.com/group/gamsworld.
For more options, visit https://groups.google.com/groups/opt_out.
Hi,
Yes, but setting the optcr option.
http://support.gams.com/doku.php?id=solver:what_is_optca_optcr
Stefan
On 09/11/2013 03:59 AM, Dylan Lan wrote:
Hi Stefan,
Thank you very much, it is very helpful.
By the way, is it possible for us to change the optcr?
Thanks,
Dylan
在 2013å¹´9月10日星期二UTC+8下åˆ4æ—¶30分55秒，Stefan Vigerske写é“：
Hi,
It means that SCIP has stopped the solving process when it reached the gap
limit (optcr).
http://support.gams.com/doku.php?id=solver:what_is_optca_optcr
That is, it has found a feasible solution but did not finish proving
optimality. If you run with default optcr, it means that it could prove
that the solution found is at most 10% worse (w.r.t. objective value) than
an optimal one.
Hope that helps,
Stefan
On Monday, September 9, 2013 9:53:59 AM UTC+2, Dylan Lan wrote:
Hi GAMS wolrd,
When I used SCIP solver to process my model, which is MINLP and consists
of a lot of discrete variables, the solver came up with optimal solution
but indicated ‘solving was interrupted [gap limit reached]’. What does it
mean?
Thanks,
Dylan
–
To unsubscribe from this group and stop receiving emails from it, send an email to gamsworld+unsubscribe@googlegroups.com.
To post to this group, send email to gamsworld@googlegroups.com.
Visit this group at http://groups.google.com/group/gamsworld.
For more options, visit https://groups.google.com/groups/opt_out.
Hi, stefan,
Thanks you very much.
regards,
Dylan
在 2013å¹´9月11日星期三UTC+8下åˆ4æ—¶37分43秒，Stefan Vigerske写é“：
Hi,
Yes, but setting the optcr option.
http://support.gams.com/doku.php?id=solver:what_is_optca_optcr
Stefan
On 09/11/2013 03:59 AM, Dylan Lan wrote:
Hi Stefan,
Thank you very much, it is very helpful.
By the way, is it possible for us to change the optcr?
Thanks,
Dylan
在 2013å¹´9月10日星期二UTC+8下åˆ4æ—¶30分55秒，Stefan Vigerske写é“：
Hi,
It means that SCIP has stopped the solving process when it reached the gap
limit (optcr).
http://support.gams.com/doku.php?id=solver:what_is_optca_optcr
That is, it has found a feasible solution but did not finish proving
optimality. If you run with default optcr, it means that it could prove
that the solution found is at most 10% worse (w.r.t. objective value) than
an optimal one.
Hope that helps,
Stefan
On Monday, September 9, 2013 9:53:59 AM UTC+2, Dylan Lan wrote:
Hi GAMS wolrd,
When I used SCIP solver to process my model, which is MINLP and consists
of a lot of discrete variables, the solver came up with optimal solution
but indicated ‘solving was interrupted [gap limit reached]’. What does it
mean?
Thanks,
Dylan
–
To unsubscribe from this group and stop receiving emails from it, send an email to gamsworld+unsubscribe@googlegroups.com.
To post to this group, send email to gamsworld@googlegroups.com.
Visit this group at http://groups.google.com/group/gamsworld.
For more options, visit https://groups.google.com/groups/opt_out.