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Re: [Help-glpk] glpk and R (using SWIG)


From: Nigel Galloway
Subject: Re: [Help-glpk] glpk and R (using SWIG)
Date: Tue, 22 Jun 2010 14:55:40 +0100

The bad news is I think these examples are lost to history.

The good news I have some better ones. Do you think the new wiki is a good 
place for them? Hopefully it will take better care of them than Yahoo did the 
old ones.

> ----- Original Message -----
> From: "glpk xypron" <address@hidden>
> To: "Nigel Galloway" <address@hidden>
> Cc: address@hidden, address@hidden
> 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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