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Re: Center of mass??? [message #17756 is a reply to message #17710]

Thu, 11 November 1999 00:00

davidf
Messages: 2866
Registered: September 1996

Senior Member

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

> Thanks for the help!

> David Fanning wrote:
>
>> 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, I'll say this for the simple-minded approach:
it apparently works. :-)

Cheers,

David

P.S. Let's just say I'm still scratching my head
and getting a headache sorting through JD's more
general approach to the problem. I wish I would
have paid more attention in those math classes
way back when. I was still trying to get through
the Alice in Wonderland required reading. :-(

--
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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