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Re: Q: Quantil calculation in IDL? [message #17522 is a reply to message #17379]

Fri, 15 October 1999 00:00

J.D. Smith
Messages: 214
Registered: August 1996

Senior Member

Pavel Romashkin wrote:
>
> Am I missing something? Is 75%-quantils not just a value of the sorted array 3/4
> of the way through?
>
> IDL> a = bindgen(256,256)
> IDL> b = sort(a)
> IDL> c = n_elements(b)*3/4
> IDL> print, (a[b])[c]
> 192

A minor quibble, but a[b[c]] is faster, since it doesn't recopy the
entire 256x256 array as (a[b])[c] does.

JD

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J.D. Smith |*| WORK: (607) 255-5842
Cornell University Dept. of Astronomy |*| (607) 255-6263
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[Message index]

		Q: Quantil calculation in IDL? By: joerg.mosthaf on Fri, 15 October 1999 00:00
		Re: Q: Quantil calculation in IDL? By: m218003 on Mon, 25 October 1999 00:00
		Re: Q: Quantil calculation in IDL? By: James Tappin on Mon, 18 October 1999 00:00
		Re: Q: Quantil calculation in IDL? By: joerg.mosthaf on Mon, 18 October 1999 00:00
		Re: Q: Quantil calculation in IDL? By: J.D. Smith on Fri, 15 October 1999 00:00
		Re: Q: Quantil calculation in IDL? By: J.D. Smith on Fri, 15 October 1999 00:00
		Re: Q: Quantil calculation in IDL? By: Pavel Romashkin on Fri, 15 October 1999 00:00
		Re: Q: Quantil calculation in IDL? By: davidf on Fri, 15 October 1999 00:00

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