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Re: Using where() on slices of data cubes [message #68333 is a reply to message #68327]

Tue, 20 October 2009 07:39

penteado
Messages: 866
Registered: February 2018

Senior Member
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On Oct 20, 10:22 am, 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.

It does not apply to this case, but for future reference, it may be
useful to know that it could be done directly if the slice was the
other way around (a subset of indices on the left):

w=where(cube[*,*,i] lt 0)
nel=n_elements(cube[*,*,i])
cube[i*nel+w]=1e24

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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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