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Re: Array index for arrays [message #28335]

Tue, 04 December 2001 06:35

Craig Markwardt
Messages: 1869
Registered: November 1996

Senior Member

the_cacc@hotmail.com (trouble) writes:

> z=indgen(4,4)
> ix=[0,1]
> help,z[ix,ix]
>
> <Expression> INT = Array[2]
...
> Not what I expected !?!

Yes, this has burned me a couple of times. The short answer is that
when you combine two or more "index lists", then they are treated as
one-for-one coordinate lists. What you want can be achieved in two
separate indexing steps:

help, (z[ix,*])[*,iy]

Ie, first do the X index then the Y index.

Craig

--
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Craig B. Markwardt, Ph.D. EMAIL: craigmnet@cow.physics.wisc.edu
Astrophysics, IDL, Finance, Derivatives | Remove "net" for better response
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		Re: Array index for arrays By: Craig Markwardt on Tue, 04 December 2001 06:35
		Re: Array index for arrays By: air_jlin on Tue, 04 December 2001 18:40

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