> In general I don't recommend generating instance files like MPS or CPLEX
> LP directly. If you don't want to use a modeling language because of
> size or other issues, then look at the APIs that solvers have to
> directly input an instance. COIN-OR OSI (Open Solver Interface)
> provides an A
Guney Petek wrote:
On Wed, Mar 19, 2008 at 4:09 AM, Andrew Makhorin <[EMAIL PROTECTED]> wrote:
I read that "... the mathprog translator is greedy to the memory
..." and actually I am having problem getting the model generated for
a large instance. glpsol runs out of memory on a machine with 1.5
> Hopefully the Windows version will be included in 4.28.
I included it, however, at the moment it is disabled.
See the file glplib12.c for details.
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Hello Andrew,
> Please inform me if the routines below are sufficient for our
> purposes. (I have not implemented a Windows version yet, however, it
> will be not so hard, I think.)
The routines seem to be sufficient. According to the ltdl documentation
lt_dlinit may be called multiple times. Th
Xypron,
Just for your information: please see below shared library routines
I have added to glplib module.
To obtain an error message there is a new routine xerrmsg introduced
in 4.28 (it is also used by other glpk library routines).
Please inform me if the routines below are sufficient for our
On Thu, 20 Mar 2008, Axel Simon wrote:
> I need to use the lpx_exact function and find that the performance on
> repeatedly running a 100x10 variable problem is about 70x slower than
> using doubles. It turns out that the program spends 40% of it's time
> calculating the gcd when canonicalizing fra
Hello Kilmos
have a look at
http://www-fp.mcs.anl.gov/otc/Guide/CaseStudies/simplex/applet/SimplexTool.html
Best regards
Xypron
Original-Nachricht
> Datum: Thu, 20 Mar 2008 06:29:14 +0100
> Von: "Kilmos Atom" <[EMAIL PROTECTED]>
> An: help-glpk@gnu.org
> Betreff: [Help-glpk] L
Hello Andrew,
essentially the following functions are already wrappers.
glpmpl04.c:
DLMODULE load_library(const char *modulename)
void *load_symbol(DLMODULE module, const char *name)
void unload_library(DLMODULE module)
What is missing is considering the case that libdl shall be used instead of
Hi,
I need to use the lpx_exact function and find that the performance on
repeatedly running a 100x10 variable problem is about 70x slower than
using doubles. It turns out that the program spends 40% of it's time
calculating the gcd when canonicalizing fractions. Is there a way to use
integers (ra
Hi Xypron,
I have looked through your code. Thank you for your efforts.
Using dynamic libraries is a separate problem, and I think we need to
consider it first and separately from implementing database interface.
The main difficult is that using dynamic libraries is out of the ISO C
standard. A
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