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Re: FOR loops removal [message #61972 is a reply to message #61971]

Tue, 19 August 2008 06:43

Wox
Messages: 184
Registered: August 2006

Senior Member

On Tue, 19 Aug 2008 05:38:50 -0700 (PDT), loebasboy
<stijn.vdl@gmail.com> wrote:

> FOR l = 0, n*2 DO BEGIN
> temp = 0
> FOR i =0,max_y-1 DO BEGIN
> FOR j=0,max_x-1 DO BEGIN
> jtemp = j + l
> jtemp2 = j + n
> temp = temp + (arr[i,jtemp] * arr [i,jtemp2])
> ENDFOR
> ENDFOR
> output[l] = temp/(max_x*max_y)
> ENDFOR

The code below is a start. Does this processing have a name? It feels
familiar somehow. Btw, in IDL the first index of an array is the
column and the second is the row. So in your case y are the columns
and x are the rows. No problem with that off course, just check
whether this is how you intended it.

n = 8
max_x = 5
max_y = 5
output = fltarr(2*n+1)
arr = findgen(max_y, 2*n+max_x) +1

arr2=arr[0:max_y-1,n:max_x-1+n]
FOR l = 0, 2*n DO $
output[l] = total(arr[0:max_y-1,l:max_x-1+l]*arr2)
output/=max_x*max_y

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[Message index]

		Re: FOR loops removal By: David Fanning on Tue, 19 August 2008 06:51
		Re: FOR loops removal By: Wox on Tue, 19 August 2008 06:43
		Re: FOR loops removal By: Jeremy Bailin on Wed, 20 August 2008 04:50
		Re: FOR loops removal By: loebasboy on Wed, 20 August 2008 00:24
		Re: FOR loops removal By: Chris[6] on Tue, 19 August 2008 13:04

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