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Re: [Help-glpk] sensitivity analysis table in glpk
From: |
Andrew Makhorin |
Subject: |
Re: [Help-glpk] sensitivity analysis table in glpk |
Date: |
Sat, 26 Dec 2009 11:05:00 +0300 |
Saturday, December 26, 2009, 11:02:20 AM, you wrote:
>> I tried it on my mac os x and /dev/stdout also corresponds to the
>> standard output (since it is a unix variant).
>> The problem is, of course, the out-dated LPX_OPT. Even after glpsol
>> found the optimal solution, I still got the output saying:
>> "
>> ...
>> Size of triangular part = 1
>> 0: obj = 1.825236167e+05 infeas = 2.463e+05 (0)
>> * 1: obj = 2.705000000e+03 infeas = 0.000e+00 (0)
>> * 28: obj = 2.243054181e+05 infeas = 0.000e+00 (0)
>> OPTIMAL SOLUTION FOUND
>> Time used: 0.0 secs
>> ...
>> No range information since solution is not optimal.
>> End of output
>> "
> This is a scaling/tolerance issue, i.e. glp_simplex reports that
> the status is optimal, but glp_warm_up does not agree with that.
> Please replace line 70, file glplpx03.c:
> lpx_warm_up(lp);
> by the following line:
> glp_factorize(lp);
> This must help.
> (I will try to re-implement lpx_print_sens_bnds using new api
> routines.)
Another way is just disable the lp presolver (--nopresol).
- Re: [Help-glpk] sensitivity analysis table in glpk, (continued)
- Re: [Help-glpk] sensitivity analysis table in glpk, Andrew Makhorin, 2009/12/25
- Re: [Help-glpk] sensitivity analysis table in glpk, Andrew Makhorin, 2009/12/25
- Re: [Help-glpk] sensitivity analysis table in glpk, Andrew Makhorin, 2009/12/25
- Re: [Help-glpk] sensitivity analysis table in glpk, Yingjie Lan, 2009/12/26
- Re: [Help-glpk] sensitivity analysis table in glpk, Yingjie Lan, 2009/12/26
- Re: [Help-glpk] sensitivity analysis table in glpk, Andrew Makhorin, 2009/12/26
- Re: [Help-glpk] sensitivity analysis table in glpk, Andrew Makhorin, 2009/12/26
- Re: [Help-glpk] sensitivity analysis table in glpk, Yingjie Lan, 2009/12/26
- Re: [Help-glpk] sensitivity analysis table in glpk, Yingjie Lan, 2009/12/29
- Re: [Help-glpk] sensitivity analysis table in glpk, Andrew Makhorin, 2009/12/29
- Re: [Help-glpk] sensitivity analysis table in glpk,
Andrew Makhorin <=
Re: [Help-glpk] sensitivity analysis table in glpk, Yingjie Lan, 2009/12/25