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Re: MODE in IDL? [message #47104 is a reply to message #47103]

Tue, 24 January 2006 19:13

Jonathan Greenberg
Messages: 91
Registered: November 2002

Member

David:
That is the defintion of mode -- it really surprised me this isn't built
into IDL, since its a common and basic enough statistic.

--j

"David Fanning" <davidf@dfanning.com> wrote in message
news:MPG.1e40988f4505ca03989b37@news.frii.com...
> 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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