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Re: Using where() on slices of data cubes [message #68330 is a reply to message #68327]

Tue, 20 October 2009 09:18

greg.addr
Messages: 160
Registered: May 2007

Senior Member

> Is'nt this more efficient ?
> cube[1,*,*] = 1e24*(cube[1,*,*] lt 0) + cube[1,*,*]*(cube[1,*,*] ge
> 0)

I reckon you're copying out the slice twice, processing through it 5
times, and copying it back. That's compared to one scan through the
slice and one indexed substitution (possibly many fewer items than one
slice). The 'reform' with /overwrite costs nothing.

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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