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SVD in WAVE broken??? [message #1582]

Fri, 10 December 1993 07:42

patel
Messages: 9
Registered: August 1992

Junior Member

Hello:

Yesterday I was talking to a friend of mine who has both WAVE and IDL
running on his machine. He claims that the SVD routine in WAVE runs
considerably slower than the SVD routine in IDL. He also told me that
for matrices of size 50000 X 20 the wave routine came back with error
message saying no space or something like that where as the IDL gets
him the results!! It was a surprise to me since I thought the core
routines in IDL and WAVE are the same. Anybody care to comment on
this?

-maqbool

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Re: SVD [message #6778 is a reply to message #1582]

Wed, 14 August 1996 00:00

hto
Messages: 15
Registered: April 1996

Junior Member

Daisei Konno <dxk1280@rit.edu> wrote:

> Hello! I am looking for a SVD that gives a complete orthogonal matricies
> for a rectangular input matrix. For a (m x n) matrix, E, SVD SHOULD
> give
> U: (m x m)
> S: (m x n)
> V: (n x n)

> if E = U ## S ## TRANSPOSE(V)

> This is implemented in MATLAB; how come not in IDL? Thanks.

I believe that SVDC in version 4.0.1 implements the SVD routine from
Numerical Recipes which should provide you what you want (I've never
used it but I have used the NRC 2.0 version which has never given me a
problem).

Howard Onishi

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