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Re: how to sort data based on other sorted data [message #57979 is a reply to message #57978]

Thu, 10 January 2008 10:47

JMB
Messages: 13
Registered: January 2008

Junior Member

> The idea is to merge your array of coordinates in a single vector that
> can be sorted. The merging has to be done in a way that x,y,z info
> doesn't mix.

You can test the following method that seems to work for integers or
unsigned integers.
[-32768,+32768] or [0,+65535]
It doesn't work with floating points!:

;***************************************************

; a xyz matrix is generated for testing:
Rows=50000
xyz=dblarr(3,Rows)

xyz[0,*]=fix((randomu(S,Rows)-0.5)*2.^16)
xyz[1,*]=fix((randomu(S,Rows)-0.5)*2.^16)
xyz[2,*]=fix((randomu(S,Rows)-0.5)*2.^16)

; the method! quite short ;-)

c=xyz[2,*]*2.^32+xyz[1,*]*2.^16+xyz[0,*]
indices=sort(c)

end
;***************************************************

You can benchmark with multisort!

Cheers,

Jerome

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[Message index]

		Re: how to sort data based on other sorted data By: placebo on Thu, 10 January 2008 12:51
		Re: how to sort data based on other sorted data By: pgrigis on Thu, 10 January 2008 11:16
		Re: how to sort data based on other sorted data By: JMB on Thu, 10 January 2008 10:52
		Re: how to sort data based on other sorted data By: JMB on Thu, 10 January 2008 10:47
		Re: how to sort data based on other sorted data By: placebo on Thu, 10 January 2008 10:23
		Re: how to sort data based on other sorted data By: JMB on Thu, 10 January 2008 05:52
		Re: how to sort data based on other sorted data By: Brian Larsen on Wed, 09 January 2008 13:30
		Re: how to sort data based on other sorted data By: wlandsman on Wed, 09 January 2008 13:03
		Re: how to sort data based on other sorted data By: Tom McGlynn on Fri, 11 January 2008 09:53

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