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Re: making a checkerboard array? [message #56021 is a reply to message #55935]

Tue, 25 September 2007 15:07

Jean H.
Messages: 472
Registered: July 2006

Senior Member

David Fanning wrote:
> JD Smith writes:
>
>
>>> I'm trying to make a checkerboard mask for an array, but I'm missing
>>> something that is likely to be obvious to the IDL array masters.
>>
>> l=lindgen(nx,ny)
>> l=(l mod (xside*2) lt xside) XOR (l/nx mod (yside*2) ge yside)
>
>
> Well, uh, it's not obvious to me. :-(
>
> Cheers,
>
> David
IDL> nx=20
IDL> ny=20
IDL> l=lindgen(nx,ny)
IDL> l=(l mod (nx*2) lt nx) XOR (l/nx mod (ny*2) ge ny)
IDL> print,l
1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
1 1 1
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0
1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
1 1 1
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0
1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
1 1 1
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0
1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
1 1 1
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0
1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
1 1 1
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0
1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
1 1 1
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0
1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
1 1 1
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0
1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
1 1 1
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0
1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
1 1 1
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0
1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
1 1 1
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0

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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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