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Re: The IDL way: Find last non-zero value [message #67737 is a reply to message #67729]

Mon, 24 August 2009 13:42

Eric Hudson
Messages: 19
Registered: June 2006

Junior Member

Thanks to all of you for the suggestions. I timed them all on several
of the larger matrices and found that the last suggestion (using
cumulative totals) was about twice as fast as the previous ones, and
about 5 times faster than the brute force loop. It did depend on how
many zeros ended each line on average. When the number was small the
loop could win, but for my typical matrices the cumulative total is
the clear winner.

Thanks again,
Eric

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[Message index]

		Re: The IDL way: Find last non-zero value By: Jeremy Bailin on Mon, 24 August 2009 19:53
		Re: The IDL way: Find last non-zero value By: Jeremy Bailin on Mon, 24 August 2009 19:43
		Re: The IDL way: Find last non-zero value By: penteado on Mon, 24 August 2009 18:35
		Re: The IDL way: Find last non-zero value By: Jeremy Bailin on Mon, 24 August 2009 17:12
		Re: The IDL way: Find last non-zero value By: Eric Hudson on Mon, 24 August 2009 13:42
		Re: The IDL way: Find last non-zero value By: cgguido on Sun, 23 August 2009 20:39
		Re: The IDL way: Find last non-zero value By: penteado on Sun, 23 August 2009 19:10
		Re: The IDL way: Find last non-zero value By: Chris[6] on Sun, 23 August 2009 17:32

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