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Re: Array Tiling - The IDL Way [message #79574 is a reply to message #79573]

Mon, 12 March 2012 11:54

Michael Galloy
Messages: 1114
Registered: April 2006

Senior Member

On 3/12/12 11:31 AM, Percy Pugwash wrote:
> I have a large array that I'd like to break up into tiles (square tiles of side T). I would like to have those tiles in the form of a stack, such that my array goes from dimensions [Nx*T,Ny*T] to [T,T,Nx*Ny].
>
> Is there any way I can do this using only functions like REFORM and TRANSPOSE and no for-loops? Ideally I'd like to do it in-place too. I've been racking my brain for a nice IDLesque way to do this, but no luck thus far...
>
> P

I think this is what you are trying to do:

IDL> a = indgen(10, 10)
IDL> b = transpose(reform(a, 2, 5, 2, 5), [1, 3, 0, 2])

This will break the image a into 5 tiles of size 2 in each dimension. So
you can do the following, e.g., to retrieve the tile at (4, 4):

IDL> print, reform(b[4, 4, *, *])
88 89
98 99

Mike
--
Michael Galloy
www.michaelgalloy.com
Modern IDL, A Guide to Learning IDL: http://modernidl.idldev.com
Research Mathematician
Tech-X Corporation

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[Message index]

		Re: Array Tiling - The IDL Way By: rogass on Mon, 12 March 2012 12:32
		Re: Array Tiling - The IDL Way By: rogass on Mon, 12 March 2012 12:28
		Re: Array Tiling - The IDL Way By: Michael Galloy on Mon, 12 March 2012 11:54
		Re: Array Tiling - The IDL Way By: Percy Pugwash on Sat, 17 March 2012 09:13

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