> I already thought of this way of getting rid of a variable. But
> keeping all the variables in the model, even bounded to 0, won´t slow
> down the simplex method? (there may be quite a lot of "removed" variables)
Every time glp_simplex returns you can check status of such variables
and remove th
I already thought of this way of getting rid of a variable. But keeping all
the variables in the model, even bounded to 0, won´t slow down the simplex
method? (there may be quite a lot of "removed" variables)
2009/5/27 Andrew Makhorin
> Rather than to "physically" remove a basic column from the
> Thanks for the quick and detailed answer. I will keep using the warm up
> functionality, because I don?t really have an idea of which variable(s)
> should enter the basis.
Rather than to "physically" remove a basic column from the problem
object with glp_del_cols you can "logically" remove it fi
Many thanks Xypron for the way to compile the library. I will try it and get
back to you if something is going wrong.
Sylvain
> Date: Sat, 23 May 2009 10:04:09 -0700 (PDT)
> From: xypron
> Subject: Re: [Help-glpk] GLPK 4.38 for Java under Linux
> To: Help-glpk@gnu.org
> Message-
2009/5/23 Andrew Makhorin
>
>
> Lpx_warm_up will be replaced by glp_warm_up, which will provide the
> same functionality.
>
>
Thanks for the quick and detailed answer. I will keep using the warm up
functionality, because I don´t really have an idea of which variable(s)
should enter the basis.
Syl
Hello Andrew,
the error was caused by some old library installed in /usr/lib while the
default
installation path of GLPK is /usr/local/lib.
Best regards
Xypron
Andrew Makhorin wrote:
>
>> Currently I am puzzled because the call to GLPK.glp_create_prob() works
>> fine, while
>> GLPK.glp_mpl
> Currently I am puzzled because the call to GLPK.glp_create_prob() works
> fine, while
> GLPK.glp_mpl_alloc_wksp() fails with
> java: symbol lookup error: /usr/local/lib/libglpk_4_38_java.so: undefined
> symbol: glp_mpl_alloc_wksp
It is unclear. Libtool must export all symbols prefixed with 'glp
> I have another question about my algorithm. I am using a Branch Price
> scheme. When I add variables, I want to use the basis of the previous run
> as the first basis of the current run (I don´t want to solve the model
> from scratch each time!)
If you add new column(s), glp_add_cols makes them
Hello Sylvain,
Sylvain Fournier wrote:
>
> I then saw that there is a glpk_4_38_java library available (
> http://winglpk.sourceforge.net/), I tried it on Windows and it seems to
> work
> fine. But there is a problem of organization in my code, as I use a
> different Java interface when running
Hi,
I have been working with GLPK for 2 or 3 months, and I´d really like to
congratulate all the people that contribute to the development of this
solver.
In fact, I am working with Java, and most of the time under Linux. But I
need to have my code run under Windows as well. As I am not sure there
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