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Re: vector of bin indices using histogram? [message #50789 is a reply to message #50782]

Wed, 18 October 2006 07:00

greg michael
Messages: 163
Registered: January 2006

Senior Member

Thanks Ben - I never met that function before! Unfortunately, it's
using a bisection search, and comes out a little slower than the the
direct calculation:

pro test2,n
x=randomu(0,n)
h = HISTOGRAM(x, BINSIZE = 0.1, LOC = loc, MIN = 0.0)

t=systime(/seconds)
mx=max(x,min=mn)
b=fix((x-mn)/(mx-mn)*10)
print,"direct calc",systime(/seconds)-t

t=systime(/seconds)
b=VALUE_LOCATE(loc, x)
print,"value_locate",systime(/seconds)-t
end

IDL> test2,5e7
direct calc 1.5470002
value_locate 2.8750000

Well, maybe the direct calculation isn't so inefficient. But histogram
must have known those numbers during its calculation. It's a pity they
got thrown away.

Greg

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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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