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improve calculation time [message #88959]

Tue, 08 July 2014 11:29

g.nacarts
Messages: 148
Registered: November 2013

Senior Member

Hello

I am trying to improve my code in order to make it faster. A part of my code is the following

DIM = make_array(301,301,/DOUBLE)
pval = 0

for i=0, 300 do begin
for j=0, 300 do begin
x = round(i + Bx[i, j])
y = round(j + By[i, j])
if (x lt 301) && (y lt 301) && (x ge 0) && (y ge 0) then begin
DIM[i,j] = SIM[x, y]
endif
pval= pval + (DIM[i,j] - TIM[i, j])^2.
endfor
endfor

Because I repeat the above procedure a lot of times it takes time to run. I noticed that the DIM array it's creating in every single iteration and I supposed that it takes time. I was wondering if I can write it in a different way in order to overwrite it in each iteration instead of delete it and create it all the time. To overwrite it I need to add it into the loop?

Regards,
Gina

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[Message index]

		improve calculation time By: g.nacarts on Tue, 08 July 2014 11:29
		Re: improve calculation time By: Matthew Argall on Tue, 08 July 2014 13:10
		Re: improve calculation time By: g.nacarts on Wed, 09 July 2014 08:38
		Re: improve calculation time By: Matthew Argall on Wed, 09 July 2014 08:57
		Re: improve calculation time By: g.nacarts on Thu, 10 July 2014 02:36
		Re: improve calculation time By: Matthew Argall on Thu, 10 July 2014 05:45
		Re: improve calculation time By: g.nacarts on Thu, 10 July 2014 06:33
		Re: improve calculation time By: Matthew Argall on Thu, 10 July 2014 06:46

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