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In article <1jom89INNlhl@rs6000.bham.ac.uk> stannaee@eee.bham.ac.uk (Mr. Eric E. Stannard) writes:
>--
>Does anyone have or know where to obtain an efficient routine to
>calculate the Singular Value Decomposition of a real matrix. The
>code would preferably be in C/C++ but Fortran is fine. 
>Is there any free library routines available to do this available by
>ftp?
>
>Thanks in advance.
>
What you want can be found in 

NUMERICAL RECIPES IN C: THE ART OF SCIENTIFIC COMPUTING
Press WH et al, 1992, SECOND EDITION, Cambridge University Press

That topic is covered in chapter 2, and routines to implement the
algorithms are provided. There is also a Numerical Recipes in FORTRAN
version of the same ideas (also look for SECOND EDITION, 1992)
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*Dr. Thomas Trusk                    *                              *
*Dept. of Cellular Biology & Anatomy * Email to ttrusk@its.mcw.edu  *
*Medical College of Wisconsin        *                              *
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In article <1jom89INNlhl@rs6000.bham.ac.uk> stannaee@eee.bham.ac.uk (Mr. Eric E. Stannard) writes:
>Does anyone have or know where to obtain an efficient routine to
>calculate the Singular Value Decomposition of a real matrix. The
>code would preferably be in C/C++ but Fortran is fine. 
>Is there any free library routines available to do this available by
>ftp?
>
>Eric Stannard

If you're going to do a lot of this sort of thing, you could get
the NAg (Numerical Analysis Group) library. It doesn't come cheap,
but it's money well spent because you'll never be stuck for a
numerical methods routine again.

Mark

--
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Multimedia Information Systems Lab | I'm a slug and I'm alright
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England                            | 'Cos I have fun with both my ends

In response to the request for Singular Value Decomposition algorithm code:

The well-known Numerical Recipes book has a pair of routines to do this; the
original book had the routines in Fortran, and they have since been translated
to Pascal and C (both by the authors, and by myself, some years ago; it's
not too much work.) These have proven robust and useful in practice. 

The Pascal code for these is available via ftp at (I think) garbo.uwasa.fi
in the msdos archive, turbopas directory, and is called something like 
nrpas13.zip.  The C & Fortran code is not, to my knowledge, available via ftp
and the Pascal code won't make too much sense without the book.

Hope this helps; I've used these routines to obtain least-squared solutions
for years and recommend them highly.

-greg

Greg DeLozier/Sr.Analyst, Loral Defense Systems/Grad Student, Kent State Univ.