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Faster way to "shift" array? [message #84785]

Tue, 11 June 2013 05:50

rjp23
Messages: 97
Registered: June 2010

Member

I have a longitude array which ranges from 0 to 360 but I want it to range from -180 to 180.

Currently I'm doing this:
lon=shift(lon, n_elements(lon)/2.)
lon[where(lon GT 180)]=lon[where(lon GT 180)]-360.

The lon array is 3600 elements and the shift command is taking around 1 second. When multiplied by the thousands of files I need to handle this becomes quite a considerable time component.

Is there a faster way to do this?

Cheers

Rob

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[Message index]

		Faster way to "shift" array? By: rjp23 on Tue, 11 June 2013 05:50
		Re: Faster way to "shift" array? By: rjp23 on Tue, 11 June 2013 05:52
		Re: Faster way to "shift" array? By: David Fanning on Tue, 11 June 2013 06:04
		Re: Faster way to "shift" array? By: rjp23 on Tue, 11 June 2013 06:23
		Re: Faster way to "shift" array? By: David Fanning on Tue, 11 June 2013 06:28
		Re: Faster way to "shift" array? By: David Fanning on Tue, 11 June 2013 06:35
		Re: Faster way to "shift" array? By: rjp23 on Tue, 11 June 2013 06:44
		Re: Faster way to "shift" array? By: Fabzi on Tue, 11 June 2013 09:33
		Re: Faster way to "shift" array? By: David Fanning on Tue, 11 June 2013 10:23
		Re: Faster way to "shift" array? By: Yngvar Larsen on Tue, 11 June 2013 14:39

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