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Re: replacing blocks in an array with other array values? [message #78818 is a reply to message #78817]

Sun, 25 December 2011 15:44

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Ecaterina Coman writes:

> I have a 4*4 array, for example, and i want to replace the center 2*2
> block of an array with the values in another array
>
> lets say A is 4*4
> and B is 2*2
> I tried doing A[1:2,1:2]=B but it doesn't change anything in A
> on the other hand, when I put A[1:2,1:2]=some scalar, it replaces the
> whole block by that scalar and works
>
> i feel like there should be a simple way to do this but cannot figure
> it out

You will have to specify the lower-left corner of the
array, like this:

IDL> a = indgen(4, 4)
IDL> b = indgen(2,2)+20
IDL> a[1,1] = b
IDL> print, a
0 1 2 3
4 20 21 7
8 22 23 11
12 13 14 15

Cheers,

David

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

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[Message index]

		Re: replacing blocks in an array with other array values? By: Ecaterina Coman on Sun, 25 December 2011 20:42
		Re: replacing blocks in an array with other array values? By: David Fanning on Sun, 25 December 2011 15:44
		Re: replacing blocks in an array with other array values? By: penteado on Sun, 25 December 2011 15:43

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