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Re: More fun [message #22486 is a reply to message #22481]

Mon, 20 November 2000 00:00

Martin Schultz
Messages: 515
Registered: August 1997

Senior Member

"J.D. Smith" wrote:
>
> 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+v)/2, (v+v)/2, (v+v)/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.
>
> --
> J.D. Smith | WORK: (607) 255-6263
> Cornell Dept. of Astronomy | (607) 255-5842
> 304 Space Sciences Bldg. | FAX: (607) 255-5875
> Ithaca, NY 14853 |

Missing the bonus, I would suggest
nv=N_Elements(v)/5
res=0.5*( v[lindgen(nv)*5] + v[lindgen(nv)*5+4] )

But I am sure there is a way to do this with histogram ;-)

Cheers,
Martin

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[[ phone: +49 40 41173-308 [[
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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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