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Re: matrix multiplication [message #63080 is a reply to message #911]

Tue, 28 October 2008 11:42

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

russ writes:

> Probably a stupid question but I haven't used idl for a while
>
> Is there a quicker way of doing this?
>
> a=fltarr(1000,20)
> b=fltarr(20)
>
> for i=0,999 do begin
> a(i,*)=a(i,*)*b
> endfor

It might be faster to realize the end result is going
to be an array of zeros than it would be to actually
write the code. :-)

But, I think you want this:

a = a * rebin(reform(b, 1, 20) ,1000, 20)

Cheers,

David
--
David Fanning, Ph.D.
Coyote's Guide to IDL Programming (www.dfanning.com)
Sepore ma de ni thui. ("Perhaps thou speakest truth.")

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[Message index]

		matrix multiplication By: c1dje on Mon, 22 March 1993 14:51
		Re: Matrix multiplication By: Haje Korth on Fri, 14 November 2003 09:48
		Re: matrix multiplication By: Chris[6] on Tue, 28 October 2008 13:59
		Re: matrix multiplication By: russ[1] on Tue, 28 October 2008 14:32
		Re: matrix multiplication By: David Fanning on Tue, 28 October 2008 11:42
		Re: matrix multiplication By: Vince Hradil on Tue, 28 October 2008 19:17

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