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Re: histogram and binsize problems [message #34239]

Thu, 27 February 2003 13:12

JD Smith
Messages: 850
Registered: December 1999

Senior Member

On Thu, 27 Feb 2003 09:52:33 -0700, Chad Bender wrote:

> Hi-
>
> I'm encountering some confusion using the histogram function when
> specifying the min, max, and binsize keywords. I looked at JD Smith's
> tutorial. But I couldn't find the answer to my question there, as all I
> really want is a plain old histogram, not some fancy array manipulation.

I think what you are after is in the tutorial, just up front in the
part people skip over:

NBINS
A relative of BINSIZE, NBINS is something of a misnomer. The
relation HISTOGRAM uses to compute the bin size if passed NBINS is:

BINSIZE=(MAX-MIN)/(NBINS-1)

and if NBINS is specified, MAX is changed to be (independent of
any value passed as MAX):

MAX=NBINS*BINSIZE+MIN

As such, it's probably better to avoid NBINS, if you care about
the MAX value staying put. A better relation which would leave MAX as
is and give you exactly NBINS bins between MIN and MAX:

BINSIZE=(MAX-MIN)/NBINS

Good luck,

JD

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[Message index]

		Re: histogram and binsize problems By: JD Smith on Thu, 27 February 2003 13:12
		Re: histogram and binsize problems By: David Fanning on Thu, 27 February 2003 12:00
		Re: histogram and binsize problems By: K. Bowman on Thu, 27 February 2003 11:31
		Re: histogram and binsize problems By: Chad Bender on Thu, 27 February 2003 11:26
		Re: histogram and binsize problems By: Liam E. Gumley on Thu, 27 February 2003 10:36
		Re: histogram and binsize problems By: David Fanning on Thu, 27 February 2003 09:11

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