[Clp] Fwd: problem with coin-or lp solver library

[John Forrest]

Empty problem warning is fine - just means clp could solve problem 
without doing the lp.

It looked at the model and saw that the optimal solution had to be to 
set variables to zero - so fixed all variables and deleted all rows.

So

clp opt_prod_mix.mps -solve -solution $

$ will just print solutio, x.sol will write solution to x.sol

John Forrest
On 16/01/15 07:01, haris iqbal wrote:
>
> ---------- Forwarded message ----------
> From: *haris iqbal* <haris.phnx at gmail.com <mailto:haris.phnx at gmail.com>>
> Date: Fri, Jan 16, 2015 at 12:31 PM
> Subject: Re: [Clp] problem with coin-or lp solver library
> To: Babak Moazzez <bmoazzez at ucdavis.edu 
> <mailto:bmoazzez at ucdavis.edu>>, deinst at gmail.com <mailto:deinst at gmail.com>
>
>
> what i am doing is solving a 2 variable lp problem by writing a .mps 
> file and then running it through the terminal by
>
> clp filename.mps
>
> i am attaching the .mps file also.. this problem gives the correct 
> answer using other tool but gives an empty problem warning using clp.
>
> On Fri, Jan 16, 2015 at 6:54 AM, Babak Moazzez <bmoazzez at ucdavis.edu 
> <mailto:bmoazzez at ucdavis.edu>> wrote:
>
>     If you are using clp api, use the command
>
>     solu results.txt
>
>     Clp will write the solution to a text file named results.txt
>
>     On Jan 15, 2015 6:05 AM, "haris iqbal" <haris.phnx at gmail.com
>     <mailto:haris.phnx at gmail.com>> wrote:
>
>         Hello,
>         I am trying to solve some lp problems using the clp library.
>         But i am facing some problems.
>
>         1) The optimal solution that i am getting is just the value..
>         is there a way to get the value of the co-ordinates also
>         (value of the variables for that optimal solution)..?
>
>         2) The problems gives the empty problem warning for some valid
>         solution.. those problem i have checked using some other lp
>         problem solver, and they were all valid..
>
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