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Re: chunk indexing like [message #69437 is a reply to message #69433]

Fri, 08 January 2010 06:12

Wout De Nolf
Messages: 194
Registered: October 2008

Senior Member

On Fri, 08 Jan 2010 14:08:45 +0100, Wox <spam@nomail.com> wrote:

> Hi IDLers,
>
> I know how to get
> from [2,3,1,0,5] to [0,0,1,1,1,2,4,4,4,4,4] (i.e. chunk indexing)
> but how do I get
> from [2,3,1,0,5] to [0,1,0,1,2,0,0,1,2,3,4]
> without loops that is.
>
> I have been juggling with histogram and total(.../cumulative) but I
> can figure this one out.
>
> Any ideas?

Ok, I got something working:

n=[2,3,1,0,5]
h=histogram(total(n>0,/CUMULATIVE,/int)-1,/BINSIZE,MIN=0,REVERSE_INDICES=ri)
nh=n_elements(h)
chinkind=ri[0:nh-1]-ri[0]
ind2=where([1,chinkind[1:*]-chinkind[0:nh-2]] ne 0)
print,lindgen(nh)-ind2[chinkind]

IDL> 0 1 0 1 2 0 0 1 2 3 4

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[Message index]

		Re: chunk indexing like By: David Fanning on Sun, 10 January 2010 08:09
		Re: chunk indexing like By: Wout De Nolf on Sun, 10 January 2010 08:05
		Re: chunk indexing like By: David Fanning on Sun, 10 January 2010 07:07
		Re: chunk indexing like By: Wout De Nolf on Sun, 10 January 2010 05:52
		Re: chunk indexing like By: Wout De Nolf on Sun, 10 January 2010 05:09
		Re: chunk indexing like By: Wout De Nolf on Sun, 10 January 2010 04:22
		Re: chunk indexing like By: rogass on Sat, 09 January 2010 11:07
		Re: chunk indexing like By: David Fanning on Sat, 09 January 2010 09:53
		Re: chunk indexing like By: rogass on Sat, 09 January 2010 08:50
		Re: chunk indexing like By: David Fanning on Sat, 09 January 2010 07:10
		Re: chunk indexing like By: rogass on Sat, 09 January 2010 02:15
		Re: chunk indexing like By: rogass on Sat, 09 January 2010 01:37
		Re: chunk indexing like By: pgrigis on Fri, 08 January 2010 08:16
		Re: chunk indexing like By: Wout De Nolf on Fri, 08 January 2010 06:12

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