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Re: histogram, how to trasfer from linear bins to logarithmic bin? [message #68152 is a reply to message #68146]

Wed, 30 September 2009 12:29

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

JD writes:

> Very good point. The sort is over the bin vector, which can be (and
> usually is) much shorter than the data vector. And you will likely
> setup your bin boundary vector sorted to begin with. That said, for
> me HISTOGRAM(ALOG10) is still faster than HISTOGRAM(VALUE_LOCATE) (see
> below). You'll also note some "sky is falling" razors-edge
> differences between bins if you look closely.
>
> Hist(log)) 1.9417701
> Hist(value_locate) 3.7843559

By the way, when I ran your example on my (aging) Windows
machine, I got these results:

Hist(log)) 6.6090002
Hist(value_locate) 5.1719999

Hard to say what *that* means. :-)

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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[Message index]

		Re: histogram, how to trasfer from linear bins to logarithmic bin? By: Jeremy Bailin on Thu, 01 October 2009 11:59
		Re: histogram, how to trasfer from linear bins to logarithmic bin? By: Jeremy Bailin on Thu, 01 October 2009 11:53
		Re: histogram, how to trasfer from linear bins to logarithmic bin? By: David Fanning on Wed, 30 September 2009 12:29
		Re: histogram, how to trasfer from linear bins to logarithmic bin? By: David Fanning on Wed, 30 September 2009 12:25
		Re: histogram, how to trasfer from linear bins to logarithmic bin? By: JDS on Wed, 30 September 2009 11:58
		Re: histogram, how to trasfer from linear bins to logarithmic bin? By: David Fanning on Tue, 29 September 2009 14:51
		Re: histogram, how to trasfer from linear bins to logarithmic bin? By: JDS on Tue, 29 September 2009 14:33
		Re: histogram, how to trasfer from linear bins to logarithmic bin? By: Brian Larsen on Tue, 29 September 2009 07:35
		Re: histogram, how to trasfer from linear bins to logarithmic bin? By: Brian Larsen on Tue, 29 September 2009 07:31
		Re: histogram, how to trasfer from linear bins to logarithmic bin? By: David Fanning on Mon, 28 September 2009 15:54
		Re: histogram, how to trasfer from linear bins to logarithmic bin? By: penteado on Sun, 27 September 2009 19:48

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