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Re: Array indexing [message #31548 is a reply to message #31442]

Tue, 16 July 2002 01:50

marc schellens[1]
Messages: 183
Registered: January 2000

Senior Member

Andre Kyme wrote:
> Hi everyone,
>
> I have a 2D image and want to index a bunch of (x,y) pairs.
> X is the set of x coords and Y the set of y coords. Say I want
> to set all (x,y) pairs to 200:
>
> image[X,Y]=200
>
> This is fine. But if image has multiple slices and I do:
>
> image[X,Y,0]=200
>
> all possible combinations of points in X and Y get set to 200,
> whereas I only want corresponding values in X and Y set.
> Is there some array notation I'm missing that enables this?

All possible combinations you get when the indexing arrays are of
different size.
So here you want to write:

Z=lonarr(n_elements(X))
image[X,Y,Z]=200

cheers,
:-) marc

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		array indexing question By: mmiller3 on Thu, 11 July 2002 15:57
		Re: Array indexing By: marc schellens[1] on Tue, 16 July 2002 01:50

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