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Re: Center of mass??? [message #17710 is a reply to message #17692]

Mon, 08 November 1999 00:00

davidf
Messages: 2866
Registered: September 1996

Senior Member

Paul Hick (pphick@ucsd.edu) writes:

> Reasoning by analogy to the 2D case, this should work, I think:
>
> xcm = Total( Total(Total(array,3),2) * Indgen(s[0])) / totalMass
> ycm = Total( Total(Total(array,3),1) * Indgen(s[1])) / totalMass
> zcm = Total( Total(Total(array,2),1) * Indgen(s[2])) / totalMass

Well, it seems to work in the simple-minded cases I
tried it on. :-)

I'll write it up in an article if no one else has
serious objections.

Cheers,

David
--
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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