[Clp] specifying random number seed with CLP

[John Forrest]

Greg,

In Clp/trunk I have added randomSeed which allows you to set an initial 
seed.  If set to 0 then uses time of day to generate a random seed.

If you want to use Clp/stable then it should be easy to patch if you 
look at differences in 1883.  CbcOrClpParam.?pp have changed and I also 
had to fix a benign "bug" which stopped changes being made (ClpModel.cpp)

I attach a file showing three runs.  Is that what you wanted?

John Forrest



On 24/09/12 22:12, Greg Gruber wrote:
> Hello,
> I am using the clp.exe command line tool to solve a model that I have 
> coded with GLPK.  It is working fine, but I would like to make 
> successive runs using a random numbers to change some parameters.  
> With glpsol I can do the following:
> glpsol --seed ? -m foo.mod -d foo.dat
> and a different random number seed will be used each time. When I 
> solve using clp, I do the following:
> clp foo.mod%foo.dat -solve
> But I get the same result each time, because it is using the same 
> random number seed.
> Is there a way to force a new seed?
> Thanks,
> Greg Gruber
>
>
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> Clp at list.coin-or.org
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