comp.lang.idl-pvwave archive: archive » write more efficient for loop

Home » Public Forums » archive » write more efficient for loop

Show: Today's Messages :: Show Polls :: Message Navigator
E-mail to friend

Re: write more efficient for loop [message #91637 is a reply to message #91634]

Fri, 07 August 2015 12:39

g.nacarts
Messages: 148
Registered: November 2013

Senior Member

I tried to understand what you suggested but it doesn't make a lot of sense to me.

I found in the link below that by exchanging the two FOR loops the computation time can be reduced
http://www.exelisvis.com/Support/HelpArticlesDetail/TabId/21 9/ArtMID/900/ArticleID/1799/1799.aspx

I tried it but doesn't reduce at all. Maybe I did a mistake or I didn't understand well?

N = 215L

Image_2 = make_array(N,N,/double)

for j=0L, N-1 do begin
for i=0L, N-1 do begin
x = round(i + A[i, j])
y = round(j + B[i, j])
if (x ge 0) && (y ge 0) then begin
Image_2[i,j] = Image_1[x, y]
endif
endfor
endfor

Report message to a moderator

[Message index]

		write more efficient for loop By: g.nacarts on Fri, 07 August 2015 06:25
		Re: write more efficient for loop By: Michael Galloy on Fri, 07 August 2015 06:50
		Re: write more efficient for loop By: g.nacarts on Fri, 07 August 2015 06:55
		Re: write more efficient for loop By: g.nacarts on Fri, 07 August 2015 12:39
		Re: write more efficient for loop By: Michael Galloy on Sun, 09 August 2015 18:26
		Re: write more efficient for loop By: g.nacarts on Mon, 10 August 2015 08:38

Previous Topic:	an urgent help of file conversio
Next Topic:	rot and poly_2d question

-=] Back to Top [=-

[ Syndicate this forum (XML) ] [

] [

]

Current Time: Fri Oct 10 00:04:54 PDT 2025

Total time taken to generate the page: 1.12168 seconds