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Re: Using where() on slices of data cubes [message #68335 is a reply to message #68327]

Tue, 20 October 2009 07:20

greg.addr
Messages: 160
Registered: May 2007

Senior Member

On 20 Okt., 14:22, Conor <cmanc...@gmail.com> wrote:
> I feel like this should be an easy one, but I've never quite figured
> it out. Let's say I got a data cube and I want to do something on
> just a slice of it, say I want to turn certain values in a column into
> something else:
>
> w = where( cube[1,*,*] lt 0 )
>
> It seems like you should be able to do something like this:
>
> cube[1,w] = 1e24
>
> But that doesn't work... Somehow I can't quite figure out the right
> way to do this.

This method avoids the need for any duplication:

w=where(cube[1,*,*] lt 0)
sz=size(cube,/dim)
cube=reform(cube,[sz[0],sz[1]*sz[2]],/overwrite)
cube[1,w]=1e24
cube=reform(cube,sz,/overwrite)

regards,
Greg

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[Message index]

		Re: Using where() on slices of data cubes By: David Fanning on Tue, 20 October 2009 13:32
		Re: Using where() on slices of data cubes By: JDS on Tue, 20 October 2009 13:03
		Re: Using where() on slices of data cubes By: David Fanning on Tue, 20 October 2009 13:03
		Re: Using where() on slices of data cubes By: Foldy Lajos on Tue, 20 October 2009 07:26
		Re: Using where() on slices of data cubes By: greg.addr on Tue, 20 October 2009 09:18
		Re: Using where() on slices of data cubes By: Paul Van Delst[1] on Tue, 20 October 2009 08:00
		Re: Using where() on slices of data cubes By: penteado on Tue, 20 October 2009 07:39
		Re: Using where() on slices of data cubes By: lecacheux.alain on Tue, 20 October 2009 07:34
		Re: Using where() on slices of data cubes By: greg.addr on Tue, 20 October 2009 07:20
		Re: Using where() on slices of data cubes By: Conor on Tue, 20 October 2009 06:20
		Re: Using where() on slices of data cubes By: David Fanning on Tue, 20 October 2009 06:03
		Re: Using where() on slices of data cubes By: JDS on Wed, 21 October 2009 14:52

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