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Re: Comparing 2 arrays [message #55556 is a reply to message #55546]

Sun, 26 August 2007 09:43

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Jean H. writes:

> to get back to a previous discussion we had a few month ago about being
> "sufficiently close to zero", shouldn't it be (data1.A - data2.B) LT
> epsilon * data1.A , with epsilon=(machar()).eps?

Humm, I don't recall that discussion. But I can see how
this number might meet the criteria of "sufficiently close".
On the other hand, I can also envision situations where
the number could be orders of magnitude larger and still
work for a particular application. I'm probably mistaken,
but it seems to me "sufficiently close" is an arbitrary
value that must be picked empirically to match the data
and what you are trying to do with it.

Cheers,

David

P.S. I'm just thinking that "sufficiently close" to a
black hole, for example, might be a completely different
number than "sufficiently close" to my house.

--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Sepore ma de ni thui. ("Perhaps thou speakest truth.")

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[Message index]

		Re: Comparing 2 arrays By: David Fanning on Mon, 27 August 2007 08:06
		Re: Comparing 2 arrays By: Conor on Mon, 27 August 2007 06:48
		Re: Comparing 2 arrays By: David Fanning on Sun, 26 August 2007 09:43
		Re: Comparing 2 arrays By: Jean H. on Sun, 26 August 2007 08:40
		Re: Comparing 2 arrays By: David Fanning on Sun, 26 August 2007 07:32
		Re: Comparing 2 arrays By: airy.jiang on Sun, 26 August 2007 02:39
		Re: Comparing 2 arrays By: teich on Sat, 25 August 2007 22:25
		Re: Comparing 2 arrays By: David Fanning on Sat, 25 August 2007 21:47
		Re: Comparing 2 arrays By: David Fanning on Sat, 25 August 2007 21:45
		Re: Comparing 2 arrays By: David Fanning on Tue, 28 August 2007 08:15
		Re: Comparing 2 arrays By: James Kuyper on Mon, 27 August 2007 10:40
		Re: Comparing 2 arrays By: Paul Van Delst[1] on Mon, 27 August 2007 10:52

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