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Re: More fun [message #22484 is a reply to message #22481]

Mon, 20 November 2000 00:00

thompson
Messages: 584
Registered: August 1991

Senior Member

"J.D. Smith" <jdsmith@astro.cornell.edu> writes:

> Here's one I just came up against. Suppose you want to rebin a vector
> to some smaller size, an integer factor smaller. E.g. 100 elements to
> 20 elements. Now, rather than the average of those elements in each
> interval, etc., you want merely the average of the first and last member
> of that interval. E.g., you want:

> [(v[0]+v[4])/2, (v[5]+v[9])/2, (v[10]+v[14])/2, ...]

> Rebin by itself can't work, I don't think.

> Takers?

> JD

> P.S. No for loops please. Bonus points if you don't build an explicit
> index list.

If the number of elements in the array is evenly divisible by the rebin factor
(such as 100 is evenly divisible by 5), then the following should work

TEMP = REFORM(ARRAY, M, N_ELEMENTS(ARRAY)/M)
RESULT = REFORM(TEMP(0,*) + TEMP(M-1,*)) / 2.

William Thompson

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[Message index]

		Re: More fun By: davidf on Mon, 20 November 2000 00:00
		Re: More fun By: Jaco van Gorkom on Mon, 20 November 2000 00:00
		Re: More fun By: thompson on Mon, 20 November 2000 00:00
		Re: More fun By: Martin Schultz on Mon, 20 November 2000 00:00

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