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Re: FOR loops removal [message #61971]

Tue, 19 August 2008 06:51

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Wox writes:

> The code below is a start. Does this processing have a name? It feels
> familiar somehow. Btw, in IDL the first index of an array is the
> column and the second is the row. So in your case y are the columns
> and x are the rows. No problem with that off course, just check
> whether this is how you intended it.

And, of course, it *will* matter (especially in loops) how
you access the data. Always keep in mind that internally
data is stored in memory in row order (column indices vary
faster than row indices). Loops that keep this in mind are
fast. Loops that don't keep this in mind are what IDL users
complain about. :-)

Cheers,

David
--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Sepore ma de ni thui. ("Perhaps thou speakest truth.")

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[Message index]

		Re: FOR loops removal By: David Fanning on Tue, 19 August 2008 06:51
		Re: FOR loops removal By: Wox on Tue, 19 August 2008 06:43
		Re: FOR loops removal By: Jeremy Bailin on Wed, 20 August 2008 04:50
		Re: FOR loops removal By: loebasboy on Wed, 20 August 2008 00:24
		Re: FOR loops removal By: Chris[6] on Tue, 19 August 2008 13:04

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