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Re: Center of mass??? [message #17778 is a reply to message #17710]

Mon, 08 November 1999 00:00

davidf
Messages: 2866
Registered: September 1996

Senior Member

Anders Wennerberg (anders@mrc.ks.se) writes:

> I have tried to find a routine that could calculate the center of
> mass, in preliminary 2D but in near future 3D. I would be happy if
> anyone could give direction where to find that kind of routine.

Here is how you do it in 2D. I've never had to extend
this to 3D, but when you figure it out, please let us
know. I'll write up an article on it. :-)

s = Size(array, /Dimensions)
totalMass = Total(array)
xcm = Total(Total(array,2) * Indgen(s[0])) / totalMass
ycm = Total(Total(array,1) * Indgen(s[1])) / totalMass

Cheers,

David

P.S. Thanks to David Foster for the algorithm above.

--
David Fanning, Ph.D.
Fanning Software Consulting
Phone: 970-221-0438 E-Mail: davidf@dfanning.com
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Toll-Free IDL Book Orders: 1-888-461-0155

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[Message index]

		Re: Center of mass??? By: Jonathan Joseph on Tue, 09 November 1999 00:00
		Re: Center of mass??? By: J.D. Smith on Tue, 09 November 1999 00:00
		Re: Center of mass??? By: Dick Jackson on Tue, 09 November 1999 00:00
		Re: Center of mass??? By: davidf on Mon, 08 November 1999 00:00
		Re: Center of mass??? By: Paul Hick on Mon, 08 November 1999 00:00
		Re: Center of mass??? By: davidf on Thu, 11 November 1999 00:00
		Re: Center of mass??? By: Anders Wennerberg on Thu, 11 November 1999 00:00
		Re: Center of mass??? By: J.D. Smith on Wed, 10 November 1999 00:00
		Re: Center of mass??? By: davidf on Mon, 08 November 1999 00:00

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