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Re: Sum to Arrays [message #4342 is a reply to message #4243]

Fri, 19 May 1995 00:00

mole
Messages: 5
Registered: April 1995

Junior Member

Fergus Gallagher (F.Gallagher@nerc.ac.uk) wrote:
: phrje@csv.warwick.ac.uk (Prof. Don McK Paul) wrote:
: >We wish to e.g. sum the columns of a 2d array and store the results in a
: >1d array. Is there any way to accomplish this without using FOR loops.
: >
: >Don

: The total function has an optional second argument, the dimension to sum
: over, e.g.,

: IDL> x = total(y,2)

OK.... here's a tougher one to vectorize...

I want CENTROIDS, FAST!!! I'm stuck with :

x = fltarr(m)
for i=0,n do x = TOTAL(y(*,i) * findgen(n+1))

any ideas???

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Aaron Birenboim | 1007 Pampas Dr. SE |
mole@netcom.com | Albuquerque, NM 87108 |
(505) 254-1749 | |
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[Message index]

		Sum to Arrays By: phrje on Thu, 11 May 1995 00:00
		Re: Sum to Arrays By: mole on Tue, 23 May 1995 00:00
		Re: Sum to Arrays By: steinhh on Sat, 20 May 1995 00:00
		Re: Sum to Arrays By: mole on Fri, 19 May 1995 00:00

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