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Re: arrays as subscripts [message #30804 is a reply to message #30803]

Thu, 16 May 2002 20:39

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

lyubo (lzagorch@cs.wright.edu) writes:

> Suppose I have 3 arrays with the same dimensions: A, B and C.
>
> I have to use the non zero elements of A as index to access B, then use
> the accessed values from B as index to access C, and finally store the
> values from C in a new array at the previously indexed positions of B.
>
> Is there an effective way to do that in IDL? I can write a call to a
> C function but I was wondering if I can do it only in IDL.
>
> Any examples and help would be appreciated.

I'm doing this after a couple of beers, so...

I = Where(A GT 0, count)
IF count GT 0 THEN BEGIN
bindex = b[i]
b[i] = c[bindex]
ENDIF

Cheers,

David

--
David W. Fanning, Ph.D.
Fanning Software Consulting
Phone: 970-221-0438, E-mail: david@dfanning.com
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[Message index]

		Re: arrays as subscripts By: lyubo on Fri, 17 May 2002 13:38
		Re: arrays as subscripts By: Dick Jackson on Fri, 17 May 2002 07:52
		Re: arrays as subscripts By: David Fanning on Fri, 17 May 2002 00:54
		Re: arrays as subscripts By: mperrin+news on Thu, 16 May 2002 21:05
		Re: arrays as subscripts By: David Fanning on Thu, 16 May 2002 20:39

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