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Re: [Help-gsl] Linear least squares, webpages and the next release


From: Patrick Alken
Subject: Re: [Help-gsl] Linear least squares, webpages and the next release
Date: Sat, 24 Oct 2015 14:30:17 -0600
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.3.0

>> 2. What functionality would you like to see added to GSL?
> Other interplants, particularly pchip.  Interfaces to sparse direct linear 
> solvers like umfpack.
>

The current git has routines for constructing sparse matrices (ie:
gsl_spmatrix_{get,set}) for both triplet and compressed storage formats.
This should make it fairly simple to pass the relevant arrays to other
sparse solver libraries. I've personally interfaced gsl_spmatrix into
the Lis, pastix, and mumps libraries (haven't tried umfpack). All thats
needed is a simple wrapper routine to call the external library with
gsl_spmatrix.



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