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Re: Histogram: Normalised Occurrence Frequency [message #59011 is a reply to message #59009]

Thu, 28 February 2008 07:43

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Hazel writes:

> I want to plot a histogram where the number of samples in each bin are
> normalised by the total number of samples across all bins.
>
> Currently I use David's 'HISTOPLOT' and the REVERSE_INDICIES keyword
> to get the indicies in each bin. Then Jaco's HISTOBIN to count these
> for each bin.

Say what!? Isn't the count in each bin the, uh, histogram?

I would think a normalized histogram plot looks like this:

Plot, Histogram(data)/Total(Histogram(data))

> Then I normalise the bin totals and have to plot number of bins vs.
> normalised values using Plot and Psym=10.
>
> Is there an easier way to do this? Also how would I use HISTOPLOT to
> replot this normalised hist as I can't seem to get it to work.

Maybe I'll add a NORMALIZED keyword. I found a couple of other
oddities with HISTOPLOT the other day. I'll have to have a look
at it, but right now, I have to get to work. Maybe there will be
something new this weekend. :-)

Cheers,

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

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		Re: Histogram: Normalised Occurrence Frequency By: pgrigis on Thu, 28 February 2008 07:50
		Re: Histogram: Normalised Occurrence Frequency By: David Fanning on Thu, 28 February 2008 07:43

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