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Re: HISTOGRAM, binsize, and max [message #76093 is a reply to message #76092]

Wed, 18 May 2011 11:33

pgrigis
Messages: 436
Registered: September 2007

Senior Member

On May 18, 1:08 pm, andry <andry_will...@hotmail.com> wrote:
> Hi Paolo,
>
> I guess this has to do with the fact that different computers don't
> behave the same way. What OS and which version of IDL are you with?
>
> Mine is actually a
> { x86 linux unix linux 8.0 Jun 18 2010 32 64}

Maybe you have conversion to doubles enabled by default?

With floats you always get 7+1 bins:

IDL> print,1.4/0.2,format='(f20.15)'
7.000000000000000
IDL> print,140.0/20.0,format='(f20.15)'
7.000000000000000

With doubles you will get different numbers of bins:

IDL> print,1.4d/0.2d,format='(f20.15)'
6.999999999999999
IDL> print,140d/20d,format='(f20.15)'
7.000000000000000

Ciao,
Paolo

>
>
>
>
>
>
>
>> When I try that I always get 8 bins no matter what.
>> I don't see how you could get 7 bins in that situation...
>
>> IDL> hist_spd= HISTOGRAM(randomn(seed,10)*200,binsize= .
>> 20,min=0.,max=1.40) & help,hist_spd
>> HIST_SPD LONG = Array[8]
>
>> IDL> hist_spd= HISTOGRAM(randomn(seed,10)*200,binsize=
>> 20.0,min=0.,max=140.0) & help,hist_spd
>> HIST_SPD LONG = Array[8]
>
>> Ciao,
>> Paolo
>
>>> 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, binsize, and max By: pgrigis on Wed, 18 May 2011 11:41
		Re: HISTOGRAM, binsize, and max By: pgrigis on Wed, 18 May 2011 11:33
		Re: HISTOGRAM, binsize, and max By: war on Wed, 18 May 2011 10:08
		Re: HISTOGRAM, binsize, and max By: pgrigis on Wed, 18 May 2011 08:22
		Re: HISTOGRAM, binsize, and max By: David Fanning on Wed, 18 May 2011 07:23
		Re: HISTOGRAM, binsize, and max By: penteado on Wed, 18 May 2011 07:16

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