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Re: help with chunk indexing [message #54780 is a reply to message #54641]

Tue, 03 July 2007 01:11

Wox
Messages: 184
Registered: August 2006

Senior Member

On Mon, 02 Jul 2007 05:42:08 -0700, greg.addr@googlemail.com wrote:

>
> Here's a simpler way...
>
> IDL> inds = [0,1,1,2,3,3 ,3 ,3]
> IDL> n = [1,2,1,4]
> IDL> c=[0,total(n,/cum,/int)]
> IDL> print,indgen(n_elements(inds))-c[inds]
> 0 0
> 1 0 0
> 1 2 3

From the moment I used the where function, I just knew there was a
better way :-).

> For the life of me, I can't remember how to transform n = [1,2,1,4]
> ==> inds = [0,1,1,2,3,3 ,3 ,3] - I spent ages reading the IDL function
> list, but I can't find it...

http://www.dfanning.com/idl_way/chunkindex.html

But Matt knew how to do that.

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[Message index]

		Re: help with chunk indexing By: greg.addr on Mon, 02 July 2007 05:42
		Re: help with chunk indexing By: Wox on Mon, 02 July 2007 02:53
		Re: help with chunk indexing By: Wox on Tue, 03 July 2007 01:11

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