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Re: MODE in IDL? [message #47105 is a reply to message #47104]

Tue, 24 January 2006 19:04

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Jonathan Greenberg writes:

> I can't seem to find the function to calculate the mode of an array -- how
> do I do this in IDL?

I'm trying to remember back to grade school or somewhere, but
isn't the mode the maximum of the frequency distribution. I
remember that the mode isn't unique, because two numbers
could have the same frequency in the sample (bimodal, I guess)
and it is theoretically possible to have no mode (all frequencies
are the same).

But saying all that, if you have an integer array, I would
think the mode is calculated like this:

array = [1, 1, 2 , 4, 1, 3, 3, 2, 4, 5, 3, 2, 2, 1, 2, 6]
h = Histogram(array, MIN=Min(array))
bigfreq = Max(h)
mode = Where(h EQ bigfreq) + Min(array)
Print, mode
2

Cheers,

David

--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.dfanning.com/

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[Message index]

		Re: MODE in IDL? By: David Fanning on Tue, 24 January 2006 19:20
		Re: MODE in IDL? By: Jonathan Greenberg on Tue, 24 January 2006 19:13
		Re: MODE in IDL? By: David Fanning on Tue, 24 January 2006 19:04
		Re: MODE in IDL? By: JD Smith on Wed, 25 January 2006 09:14

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