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Re: indexing [message #65923 is a reply to message #55835]

Thu, 02 April 2009 05:25

Jeremy Bailin
Messages: 618
Registered: April 2008

Senior Member

On Apr 2, 1:34 am, Chris <beaum...@ifa.hawaii.edu> wrote:
> I would have done something like this, accomplishing the summation in
> two steps
>
> x = [3, 2, 3]
> y = [4, 1, 7]
> sum = total(array[*,*,1:3], 3) ; summed along z direction
> answer = total(sum[x,y]) ; summed over x,y pairs
>
> chris

Yeah, that definitely works nicely for total (I like the fact that it
doesn't need any internal index vectors, and that the intermediate
stage is a constant size independent of npair and nz), which is what
I'm doing today. But it wouldn't work for the more generic case where
I want to do something else to those values - for example, I've needed
to do the equivalent with median before, and that won't work as a 2-
step process.

-Jeremy.

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[Message index]

		Indexing arrays with arrays By: Conor on Fri, 21 September 2007 08:18
		Re: indexing By: Jeremy Bailin on Thu, 02 April 2009 05:25
		Re: indexing By: Dick Jackson on Thu, 02 April 2009 09:49
		Re: indexing By: Chris[6] on Wed, 01 April 2009 22:34
		Re: indexing By: Jeremy Bailin on Wed, 01 April 2009 18:17

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