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Re: histogram produces extra bin in 64-bit IDL 8.0 [message #76027 is a reply to message #76026]

Fri, 13 May 2011 07:08

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Eric Tittley writes:

> Consider the following code:
> IDL> D=randomu(32,3200);
> IDL> N=histogram(D,min=0.,max=1.,binsize=0.1,Locations=X)
>
> In IDL 32-bit:
> IDL> print, size(N)
> 1 10 3 10
> IDL> print, X
> 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9
> IDL> print, !version
> { x86 linux unix linux 8.0 Jun 18 2010 32 64}
>
> In 64-bit IDL:
> IDL> print, size(N)
> 1 11 3 11
> IDL> print, X
> 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
> IDL> print, !version
> { x86_64 linux unix linux 8.0 Jun 18 2010 64 64}
>
> As you can see, the 64-bit version produces an extra erroneous bin, contrary to the what is expected from the help pages for histogram.

Undoubtedly a consequence of the razor's edge:

http://www.idlcoyote.com/math_tips/razoredge.html

Cheers,

David

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

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[Message index]

		Re: histogram produces extra bin in 64-bit IDL 8.0 By: David Fanning on Fri, 13 May 2011 07:50
		Re: histogram produces extra bin in 64-bit IDL 8.0 By: Foldy Lajos on Fri, 13 May 2011 07:28
		Re: histogram produces extra bin in 64-bit IDL 8.0 By: EddE on Fri, 13 May 2011 07:27
		Re: histogram produces extra bin in 64-bit IDL 8.0 By: penteado on Fri, 13 May 2011 07:13
		Re: histogram produces extra bin in 64-bit IDL 8.0 By: David Fanning on Fri, 13 May 2011 07:08
		Re: histogram produces extra bin in 64-bit IDL 8.0 By: war on Wed, 18 May 2011 08:04

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