[Clp] Issue with Clp executable for maximization and for binary variables

[John Forrest]

Sourav,

1.  -maximize is just a flag - you should follow it with -dualsimplex or 
similar.
2. Clp does not solve integer problems - Cbc does so download that.

John Forrest
On 20/05/14 10:42, Sourav Garg wrote:
> Hello,
>
> I am using Clp1.15.6 on an Ubuntu 12.04 machine.
> I have compiled and installed the executable as mentioned in the 
> readme install notes, which went successful.
>
> 1. I have been trying some linear programs using the Clp executable 
> with a mps file. It gives me right solution for a minimization problem 
> (which is the default direction of optimisation), but it doesn't give 
> me correct solutions for maximisation problems.
>
> For maximisation, I use it as follows:
> ./clp ./my.mps -maximize -solution solFile
>
> What I get in the file is:
> status unknown
> objective value 0
> columns val 0 as well..
>
> 2. Apart from this, I have a Binary Integer Program problem, for 
> minimisation, in which I pass all the bounds as BV in the mps file.
> But in the solution I get floating point values for the non zero 
> columns instead of getting the value of 1. I wanted to know if Binary 
> Integer Programming is supported with the library?
>
> Thanks,
> Sourav
>
>
>
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