Re: pseudoinverse

Hi Michael,

Thanks so much for PINV.  It solves a basic problem, and
I think it will make a useful
addition to Matlisp.  Just one more thing to think about.
Can you say something about the difference between
your approach (using SVD) and the LAPACK routines called
DGELS and DGELSD. Numerical stability?

Your question on MACH pinpoints a fundamental issue in Matlisp.
Almost all (if not all) Matlisp routines use the underlying
fortran implementation to do the work.  Unless anything has
changed, the MACH is the one that fortran would use by default.
If this is not sufficient, or you need explicit access to this
number, we need to do some extra work (most likely in the
config file for matlisp). 

Best, Tunc



"Michael A. Koerber" wrote:
> 
> Nicolas,
> 
> > I don't know about the other members of this mailing list, but what
> > concerns me: I would like to see discussions about new add-ons on the
> > matlisp-user list.  The traffic is not large here and it would be nice
> 
> My initial post, to [email protected] is in compliance
> with your request.  The only thing more I could have done was to post
> my thought process...not something that most want to see :-).
> 
> So...disucssion is now open...do Matlisp user want a PINV command added?
> 
> **************************************************
> Dr Michael A. Koerber           Micro$oft Free Zone
> MIT/Lincoln Laboratory
> 
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