[Clp] Questions about CLP (which I couldn't find in the FAQ, possibly because they're super-outdated)

[Jonathan Currie]

Hi Andrea,

 

Have a look at some of the examples in Clp/examples. Specifically
addColumns.cpp might be of assistance. I'm not sure about calling C++ code
from Fortran however, you may need to experiment with the C interface (see
driverC.c).

 

Re afiro, I obtain an objective of -464.7531 using Clp, OOQP, SCIP and
linprog. I assume this is the correct answer? I used Clp v1.15.2 with
presolve on and the Dual Simplex algorithm. The barrier algorithm also
obtains the same solution for me.

 

Jonathan

 

From: clp-bounces at list.coin-or.org [mailto:clp-bounces at list.coin-or.org] On
Behalf Of Andrea Bertoldo
Sent: Thursday, 19 September 2013 8:21 p.m.
To: clp at list.coin-or.org
Subject: [Clp] Questions about CLP (which I couldn't find in the FAQ,
possibly because they're super-outdated)

 

Hello everyone,

I have been trying out CLP a little bit to see how well it works, and I've
got a couple of questions:
- is it possible to work without passing through a MPS file? I'm looking for
a library that works with data in memory, and I would like to be able to
call it from Fortran, and the documentation for this project is quite vast
and if there's a mention about calling CLP by passing matrices instead of
reading a MPS, well, I've missed it;
- I've found the notorious afiro problem inside the Data/Samples folder, and
I've tried to feed it to the CLP Minimum and CLP TestBarrier projects
(inside the Clp solution provided for the users to test), but the results
are different from what the real solution should be. Is there a more robust
algorithm in your library that is able to solve this problem? CLP Minimum
uses a bare ClpSimplex object, whereas CLP TestBarrier switches from an
interior to a simplex method.

Thanks in advance for your time and congratulations to all the people
involved in COIN-OR for what you have achieved! I was really impressed when
I found out how much stuff you have going on :)

Kind regards,

Andrea

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