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Re: Using histogram (or cghistogram) to get top X percent of distribution? [message #92626 is a reply to message #92620]

Tue, 26 January 2016 07:46

Med Bennett
Messages: 109
Registered: April 1997

Senior Member

On Monday, January 25, 2016 at 2:48:23 PM UTC-7, rj...@le.ac.uk wrote:
> I'm not sure if this is just me not quite understanding how histogram works.
>
> I have a large array containing data. I want to identify the array indices of the top 10% (for example) of the data. I thought I should be able to use histogram to do this quickly but can't figure out how.
>
> Any help much appreciated as always :-)

If all you need are the indices of the top 10% of the data, you can also just do

IDL> s = sort(data)
IDL> idx = s[round(0.9*n_elements(s))+1:*]

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[Message index]

		Using histogram (or cghistogram) to get top X percent of distribution? By: rjp23 on Mon, 25 January 2016 13:48
		Re: Using histogram (or cghistogram) to get top X percent of distribution? By: Helder Marchetto on Tue, 26 January 2016 06:37
		Re: Using histogram (or cghistogram) to get top X percent of distribution? By: Med Bennett on Tue, 26 January 2016 07:38
		Re: Using histogram (or cghistogram) to get top X percent of distribution? By: Med Bennett on Tue, 26 January 2016 07:46
		Re: Using histogram (or cghistogram) to get top X percent of distribution? By: penteado on Wed, 27 January 2016 06:26
		Re: Using histogram (or cghistogram) to get top X percent of distribution? By: pfp on Wed, 27 January 2016 06:51

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