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Re: histogram produces extra bin in 64-bit IDL 8.0 [message #76026 is a reply to message #76025]

Fri, 13 May 2011 07:13

penteado
Messages: 866
Registered: February 2018

Senior Member
Administrator

On May 13, 11:08 am, David Fanning <n...@idlcoyote.com> wrote:
> 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

That is what I was thinking, considering both results to be normal and
expected. But I was wondering what changed between versions.

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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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