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Re: [Help-glpk] glpk and R (using SWIG)
From: |
glpk xypron |
Subject: |
Re: [Help-glpk] glpk and R (using SWIG) |
Date: |
Thu, 17 Jun 2010 22:17:04 +0200 |
Hello Nigel,
the proposed iajaar.h looks promising.
Unfortunately the referenced download site
http://www.geocities.com/nigel_galloway/IAJAAR.zip
no longer exists.
Is there an alternative site?
> Do you rely on Java's garbage collector to dispose of these or do
> you call glpk's delete function (glp_delete_prob)?
Glp_delete_prob() only deletes objecst created by GLPK. GLPK-Java
relies on garbage collection for other objects like instances
of SWIGTYPE_p_double.
Best regards
Xypron
-------- Original-Nachricht --------
> Datum: Thu, 17 Jun 2010 15:56:56 +0100
> Betreff: Re: [Help-glpk] glpk and R (using SWIG)
>
> I assume you are creating objects in GLPK, like say a constraint matrix.
> Do you rely on Java's garbage collector to dispose of these or do you call
> glpk's delete function (glp_delete_prob)? I do the latter. I don't recall
> ever noticing R's garbage collector.
>
> So don't use carrays. I use iajaar or sparse matrix from coin. See:
> http://www.mail-archive.com/address@hidden/msg02581.html
>
> I always think that writing ia[x] = etc; ja[x] = etc; ar[x] = etc; is
> tedious. GLPK should have an add triplet function. Until then use iajaar.
>
> > ----- Original Message -----
> > From: Xypron <address@hidden>
> > To: Nigel Galloway <address@hidden>
> > Cc: "Eagle, Ken" <address@hidden>, address@hidden
> > Subject: Re: [Help-glpk] glpk and R (using SWIG)
> > Date: Wed, 16 Jun 2010 00:36:54 +0200
> >
> >
> > Hello Nigel,
> >
> > the SWIG documentation on
> > http://www.swig.org/Doc1.3/R.html
> > says:
> >
> > Currently the following features are not implemented or broken:
> > * Garbage collection of created objects
> > * C Array wrappings
> >
> > Some sort of array wrapping is needed for using GLPK.
> >
> > Best regards
> >
> > Xypron
> >
> > Nigel Galloway wrote:
> > > The benefits (and drawbacks of SWIG) have been widely discussed.
> > > Using the swig interface files discussed it is possible to
> > > produce wrappers for all glpk api in R, and add a few usful
> > > features.
> > >
>
> >
>
>
> --
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