[Couenne] Couenne with cplex

[Pietro Belotti]

Ehsan,

MUMPS is a "linear solver" in the sense that it is a solver of systems of
linear equations. It is used by Ipopt to solve NLP problems in Couenne.
Couenne uses Clp or, in your case, Cplex for solving linear programming
problems. Hence there might be both MUMPS and Cplex used in Couenne, but
they have different purposes.

Hope this helps.

Best,
Pietro

> Hallo once again
>
> I configure couenne to use cplex as an lp solver as follows.
>
> $ ../configure --with-cplex-incdir=/home/ehsan/CPLEX/cplex/include/ilcplex
> --with-cplex-lib="/home/ehsan/CPLEX/cplex/lib/x86_sles10_4.1/static_pic/libcplex.a
> -lpthread"
>
> every thing compiles well. also i saved the file couenne.opt with the
> following line
>
> lp_solver cplex
>
> But when i some a MINLP problem, couenne still give me the following
> message
> NOTE: You are using Ipopt by default with the MUMPS linear solver.
>             Other linear solvers might be more efficient (see Ipopt
> documentation)
>
> What does this means? Couenne is still using MUMPS as a lp solver?
> Secondly I am not experiencing any difference in time.
> can you please help again
> Have a nice day
> Ehsan Ullah
>
> Lehrstuhl für Symbolic Computation
>
> Passau Universität
>
> Germany
>
> Ph# 0049-851-2016296
>
> Mobile: 0049-176-45196854
>
> Email: ehsanmath at yahoo.com


-- 
Pietro Belotti
Dept. of Mathematical Sciences
Clemson University
Phone: 864-656-6765
email: pbelott at clemson.edu
http://myweb.clemson.edu/~pbelott