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Re: Matrix rank [message #57542 is a reply to message #57541]

Fri, 14 December 2007 07:42

Wox
Messages: 184
Registered: August 2006

Senior Member

On Fri, 14 Dec 2007 06:35:11 -0800 (PST), Vince Hradil
<hradilv@yahoo.com> wrote:

> IDL can do SVD, can you get the rank from that? Look up SVDC in the
> docs.

I could do this, but maybe there's a better way?

; A: integers
; B: floats
A = [[ 0,0,1], $
[ 0,1,0], $
[ 0,0,0]]
B = [0.25,0.5,1]

; Decompose A
SVDC, A, W, U, V
; Solve A.X=B
X=SVSOL(U, W, V, B)

; Check
B2=A##X
ind=where(total(abs(A),1,/pres) ne 0)

if array_equal(B[ind],B2[ind]) then print,X

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[Message index]

		Re: Matrix rank By: d.poreh on Fri, 14 December 2007 09:26
		Re: Matrix rank By: d.poreh on Fri, 14 December 2007 09:19
		Re: Matrix rank By: Vince Hradil on Fri, 14 December 2007 09:17
		Re: Matrix rank By: David Fanning on Fri, 14 December 2007 08:35
		Re: Matrix rank By: Vince Hradil on Fri, 14 December 2007 08:28
		Re: Matrix rank By: David Fanning on Fri, 14 December 2007 07:57
		Re: Matrix rank By: Wox on Fri, 14 December 2007 07:44
		Re: Matrix rank By: Wox on Fri, 14 December 2007 07:42
		Re: Matrix rank By: d.poreh on Fri, 14 December 2007 07:41
		Re: Matrix rank By: Wox on Fri, 14 December 2007 07:25
		Re: Matrix rank By: Vince Hradil on Fri, 14 December 2007 06:35
		Re: Matrix rank By: Steve Eddins on Fri, 14 December 2007 10:06
		Re: Matrix rank By: Vince Hradil on Fri, 14 December 2007 09:49

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