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Re: Interesting Rant [message #51377 is a reply to message #51314]

Wed, 15 November 2006 15:55

James Kuyper
Messages: 425
Registered: March 2000

Senior Member

gknoke wrote:
> Correct me if I'm wrong, but it's my understanding that for loops in
> IDL are so painfully slow because so much effort has been put into
> making vector operations so mind-numbingly fast, and there's some

My understanding, which may also be incorrect, is that you've got cause
and effect reversed. Loop operations are inherently slow because IDL is
fundamentally an interpreted language, so the loop body has to be
re-interpreted during each pass through the loop, just in case
something has happened that would change the interpretation of the
code.
Because loop operations are so slow, there's been a strong incentive to
provide ways of avoiding them, by making vector operations fast.

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[Message index]

		Interesting Rant By: David Fanning on Tue, 14 November 2006 09:40
		Re: Interesting Rant By: Nigel Wade on Fri, 17 November 2006 05:00
		Re: Interesting Rant By: Steve Eddins on Thu, 16 November 2006 17:00
		Re: Interesting Rant By: greg michael on Thu, 16 November 2006 09:35
		Re: Interesting Rant By: JD Smith on Fri, 17 November 2006 11:44
		Re: Interesting Rant By: Nigel Wade on Thu, 16 November 2006 01:51
		Re: Interesting Rant By: James Kuyper on Wed, 15 November 2006 15:55
		Re: Interesting Rant By: Mike[2] on Wed, 15 November 2006 13:21
		Re: Interesting Rant By: news.qwest.net on Wed, 15 November 2006 11:36
		Re: Interesting Rant By: Foldy Lajos on Wed, 15 November 2006 12:38
		Re: Interesting Rant By: gknoke on Wed, 15 November 2006 12:13
		Re: Interesting Rant By: Richard Edgar on Wed, 15 November 2006 10:31

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