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Re: Vector comparison. [message #37055 is a reply to message #37054]

Thu, 20 November 2003 08:08

Chris[1]
Messages: 23
Registered: January 2003

Junior Member

Darnit! I was so proud of my answer... only to find that Chris Lee already
proposed the same method (the "memory-hogging" one), albeit using more
lines and this "if count eq 0 then ..." after WHERE, which always annoys
me for some stupid reason. It can be avoided, which gives me an excuse to
post my suggestion anyway:

function Get_Match, a, b
na = n_elements(a) & nb = n_elements(b)
return, where(total((rebin(a,na,nb) - rebin(transpose(b), na, nb)) eq 0, 2))
end

Cheers,

Timm

Today at 10:09 -0000, Christopher Lee wrote:

> [...]
>
> function get_match,a,b
>
> ;needs some up-to-date version of IDL, 5.4 I think.
>
> na=n_elements(a)
> nb=n_elements(b)
>
> ;some checks go here to make sure the world won't explode, an exersice
> ;for the reader.
>
> reb_a=[na,nb]
> ref_a=[na,1]
> reb_b=[na,nb]
> ref_b=[1,nb]
>
> a_temp=rebin(reform(a, ref_a),reb_a)
> b_temp=rebin(reform(b, ref_b),reb_b)
>
> c_temp=a_temp-b_temp
> a_temp=0
> b_temp=0
>
> w=where(c_temp eq 0, count)
>
> c_temp=0
> ;memory...
>
> if( count gt 0) then c=w mod na
> if( count eq 0) then c=-1
>
> return, c
> end
>
> [...]

--
Timm Weitkamp <http://people.web.psi.ch/weitkamp>

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[Message index]

		Re: Vector comparison. By: JD Smith on Thu, 20 November 2003 11:38
		Re: Vector comparison. By: tam on Thu, 20 November 2003 10:55
		Re: Vector comparison. By: David Fanning on Thu, 20 November 2003 09:55
		Re: Vector comparison. By: Craig Markwardt on Thu, 20 November 2003 09:35
		Re: Vector comparison. By: tam on Thu, 20 November 2003 09:24
		Re: Vector comparison. By: David Fanning on Thu, 20 November 2003 08:52
		Re: Vector comparison. By: Chris[1] on Thu, 20 November 2003 08:08
		Re: Vector comparison. By: David Fanning on Thu, 20 November 2003 08:08
		Re: Vector comparison. By: R.Bauer on Thu, 20 November 2003 07:11
		Re: Vector comparison. By: tam on Thu, 20 November 2003 07:03
		Re: Vector comparison. By: hunter on Thu, 20 November 2003 06:49
		Re: Vector comparison. By: David Fanning on Thu, 20 November 2003 05:40
		Re: Vector comparison. By: R.Bauer on Thu, 20 November 2003 04:02
		Re: Vector comparison. By: Craig Markwardt on Thu, 20 November 2003 02:19
		Re: Vector comparison. By: Chris Lee on Thu, 20 November 2003 02:09
		Re: Vector comparison. By: R.Bauer on Thu, 20 November 2003 01:01
		Re: Vector comparison. By: Craig Markwardt on Thu, 20 November 2003 00:23
		Re: Vector comparison. By: David Fanning on Wed, 19 November 2003 18:05
		Re: Vector comparison. By: R.Bauer on Wed, 19 November 2003 17:50
		Re: Vector comparison. By: Craig Markwardt on Wed, 19 November 2003 15:48
		Re: Vector comparison. By: Pavel Romashkin on Wed, 19 November 2003 16:09

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