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Re: mean() function [message #46935 is a reply to message #46934]

Tue, 10 January 2006 15:07

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

biocpu@yahoo.com writes:

> The following looks very odd. Have any clues?
>
> IDL> y = fltarr(1008879)+35
> IDL> id = where(y ne 35, cc)
> IDL> print, cc
> 0
> ; so y is strictly 35.0 BUT
> IDL> print, mean(y)
> 35.5249
>
> IDL> print, mean(y(0:400000))
> 35.0000

Goodness! It is the 10th already and this is the first
"The Sky is Falling" post of the year. I was beginning
to wonder what was going on! :-)

You might want to have a look at this:

http://www.dfanning.com/math_tips/sky_is_falling.html

Cheers,

David
--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.dfanning.com/

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[Message index]

		Re: mean() function By: Maarten[1] on Thu, 12 January 2006 03:07
		Re: mean() function By: Paolo Grigis on Wed, 11 January 2006 06:19
		Re: mean() function By: Nigel Wade on Wed, 11 January 2006 01:49
		Re: mean() function By: Kenneth P. Bowman on Tue, 10 January 2006 19:22
		Re: mean() function By: biocpu on Tue, 10 January 2006 16:18
		Re: mean() function By: Paul Van Delst[1] on Tue, 10 January 2006 15:13
		Re: mean() function By: Paul Van Delst[1] on Tue, 10 January 2006 15:09
		Re: mean() function By: David Fanning on Tue, 10 January 2006 15:07
		Re: mean() function By: K. Bowman on Tue, 10 January 2006 15:00
		Re: mean() function By: Foldy Lajos on Tue, 10 January 2006 14:53
		Re: mean() function By: R.Bauer on Sun, 15 January 2006 00:58
		Re: mean() function By: savoie on Thu, 12 January 2006 08:49

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