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Optimizing loops [message #92368]

Wed, 02 December 2015 11:04

sam.tushaus
Messages: 14
Registered: February 2015

Junior Member

Hello all! I am working with a large number of satellite data files. The files are quite big, but I've never had this much trouble working with them before, even while doing similar processing.

The basic program structure that's the slowest is below; it also just dominates the processing power as it enters this loop. I need to do this for each file I process.

; we want to calculate the percent of each satellite pixel
; covered by land
land_perc = FLTARR(N_ELEMENTS(field1))
FOR j = 0, N_ELEMENTS(field1)-1 DO BEGIN
dist = (((land_lon - sat_lon[j])*COSD(land_lat))^2. $
+ (land_lat - sat_lat[j])^2.)^0.5*111.12

ind14 = WHERE(dist LE 14.)
land14 = land_mask(ind14)
landy = WHERE(land14 EQ 0, landy_cnt)
land_perc[j] = FLOAT(landy_cnt)/FLOAT(N_ELEMENTS(land14))*100
ENDFOR

If anyone has optimization suggestions, please let me know! Thanks :)

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[Message index]

		Optimizing loops By: sam.tushaus on Wed, 02 December 2015 11:04
		Re: Optimizing loops By: Sergey Anfinogentov on Thu, 03 December 2015 02:10
		Re: Optimizing loops By: Phillip Bitzer on Tue, 08 December 2015 08:28
		Re: Optimizing loops By: MarioIncandenza on Tue, 08 December 2015 11:05
		Re: Optimizing loops By: Russell[1] on Wed, 09 December 2015 08:29

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