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Re: Array indexing: what is IDL doing? [message #60706 is a reply to message #60704]

Mon, 09 June 2008 08:34

Heinz Stege
Messages: 189
Registered: January 2003

Senior Member

On Fri, 6 Jun 2008 09:50:33 -0700 (PDT), Conor wrote:

> So I want to pull out a small subsection from within a larger idl
> array. I want to do something like this:
>
> bigarr = findgen(500,100000)
> bigx = [indgen(50)+100,indgen(25)+200]
> bigy = indgen(10000)+50000
>
> res = bigarr[bigx,bigy]
>
> However IDL doesn't like that and says:
>
> % All array subscripts must be same size. Var = BIGARR
> % Execution halted at: $MAIN$
>
You may want to try this command:
res = bigarr[bigx,bigy,0]

IDL accepts arrays of different size as subscripts, if at least one of
the subsripts is a scalar. Here the "0" addresses an "extra"
dimension. Since this extra dimension is of size 1, it is degenerated
in the result. Array res has two dimensions, 75x10000.

Heinz

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[Message index]

		Re: Array indexing: what is IDL doing? By: Conor on Tue, 10 June 2008 07:16
		Re: Array indexing: what is IDL doing? By: Jean H. on Mon, 09 June 2008 10:12
		Re: Array indexing: what is IDL doing? By: Heinz Stege on Mon, 09 June 2008 08:34
		Re: Array indexing: what is IDL doing? By: Conor on Mon, 09 June 2008 06:02
		Re: Array indexing: what is IDL doing? By: Conor on Mon, 09 June 2008 05:56
		Re: Array indexing: what is IDL doing? By: Jeremy Bailin on Sat, 07 June 2008 06:12
		Re: Array indexing: what is IDL doing? By: Jean H. on Fri, 06 June 2008 14:15

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