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Re: help with chunk indexing [message #54644 is a reply to message #54641]

Mon, 02 July 2007 02:53

Wox
Messages: 184
Registered: August 2006

Senior Member

On Fri, 29 Jun 2007 19:51:14 -0000, "Matt B." <becker.mr@gmail.com>
wrote:

> But what is a fast way to do this
> n = [1,2,1,4] ==> inds = [0,0,1,0,0,1 ,2 ,3]

Maybe there is a more clever way, but this works:

in=[1,2,1,4]
h=histogram(total(in,/CUMULATIVE,/PRESERVE_TYPE)-1,/BINSIZE, MIN=0,REVERSE_INDICES=ri)
nh=n_elements(h)

i=ri[0:nh-1]-ri[0]
ind=shift(i,-1)-i
ind=[1,ind[0:nh-2]]
out=indgen(nh)-(where(ind))[i]

print,out ;[0,0,1,0,0,1 ,2 ,3]

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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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