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Re: making a checkerboard array? [message #55984 is a reply to message #55935]

Wed, 26 September 2007 10:39

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

JD Smith writes:

> In case that wasn't clear, here it is dfanning style ;)
>
> theRamp = LINDGEN( theNumberofXPixels , theNumberofYPixels )
> theCheckerBoardHorizontalPeriod = 2 * theCheckWidth
> theHorizontalRamp = theRamp MOD theCheckerBoardHorizontalPeriod
> theHorizontalBands = theHorizontalRamp LT theCheckWidth
>
> theRowNumbers = theRamp/theNumberofXPixels
> theCheckerBoardVerticalPeriod = 2 * theCheckHeight
> theVerticalRamp = theRowNumbers MOD theCheckerBoardVerticalPeriod
> theVerticalBands = theVerticalRamp GE theCheckHeight
>
> theCheckerBoard = theHorizontalBands XOR theVerticalBands

Oh, hell. I think I'm going back to all lowercase. :-(

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]

		making a checkerboard array? By: Mike[2] on Tue, 25 September 2007 09:27
		Re: making a checkerboard array? By: David Fanning on Wed, 26 September 2007 10:39
		Re: making a checkerboard array? By: JD Smith on Wed, 26 September 2007 10:27
		Re: making a checkerboard array? By: James Kuyper on Wed, 26 September 2007 10:29
		Re: making a checkerboard array? By: R.G.Stockwell on Wed, 26 September 2007 09:44
		Re: making a checkerboard array? By: edward.s.meinel@aero. on Thu, 27 September 2007 07:54
		Re: making a checkerboard array? By: Allan Whiteford on Wed, 26 September 2007 09:37
		Re: making a checkerboard array? By: David Fanning on Wed, 26 September 2007 08:29
		Re: making a checkerboard array? By: David Fanning on Wed, 26 September 2007 08:28
		Re: making a checkerboard array? By: Bruce Bowler on Wed, 26 September 2007 08:19
		Re: making a checkerboard array? By: Mike[2] on Wed, 26 September 2007 08:02
		Re: making a checkerboard array? By: Mike[2] on Wed, 26 September 2007 07:46
		Re: making a checkerboard array? By: David Fanning on Tue, 25 September 2007 15:59
		Re: making a checkerboard array? By: Jean H. on Tue, 25 September 2007 15:07
		Re: making a checkerboard array? By: David Fanning on Tue, 25 September 2007 14:52
		Re: making a checkerboard array? By: JD Smith on Tue, 25 September 2007 14:34
		Re: making a checkerboard array? By: David Fanning on Tue, 25 September 2007 09:56

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