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Re: vector of bin indices using histogram? [message #50780 is a reply to message #50777]

Wed, 18 October 2006 08:08

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Paolo Grigis writes:

> You might also want to change the computation of b with
> a division into a multiplication by the reciprocal (see
> example below).
>
> x=fltarr(5d7)
>
> t=systime(/seconds)
> y=x/2.
> print,systime(/seconds)-t
> 0.82191920
>
> t=systime(/seconds)
> y=x*(1./2)
> print,systime(/seconds)-t
> 0.33465910

Well, that's interesting. Do you have a theory about this? :-)

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: vector of bin indices using histogram? By: Paolo Grigis on Thu, 19 October 2006 00:45
		Re: vector of bin indices using histogram? By: greg michael on Wed, 18 October 2006 14:42
		Re: vector of bin indices using histogram? By: greg michael on Wed, 18 October 2006 14:07
		Re: vector of bin indices using histogram? By: Foldy Lajos on Wed, 18 October 2006 11:12
		Re: vector of bin indices using histogram? By: C. E. Ordonez on Wed, 18 October 2006 10:57
		Re: vector of bin indices using histogram? By: Jean H. on Wed, 18 October 2006 10:09
		Re: vector of bin indices using histogram? By: Paolo Grigis on Wed, 18 October 2006 09:56
		Re: vector of bin indices using histogram? By: Paolo Grigis on Wed, 18 October 2006 09:27
		Re: vector of bin indices using histogram? By: Foldy Lajos on Wed, 18 October 2006 09:25
		Re: vector of bin indices using histogram? By: David Fanning on Wed, 18 October 2006 09:06
		Re: vector of bin indices using histogram? By: Foldy Lajos on Wed, 18 October 2006 08:53
		Re: vector of bin indices using histogram? By: greg michael on Wed, 18 October 2006 08:38
		Re: vector of bin indices using histogram? By: Foldy Lajos on Wed, 18 October 2006 08:33
		Re: vector of bin indices using histogram? By: David Fanning on Wed, 18 October 2006 08:08
		Re: vector of bin indices using histogram? By: Paolo Grigis on Wed, 18 October 2006 07:47
		Re: vector of bin indices using histogram? By: greg michael on Wed, 18 October 2006 07:00
		Re: vector of bin indices using histogram? By: btt on Wed, 18 October 2006 06:19

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