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(more) Efficient way to generate an array whose elements are the distance from the center [message #80703]

Fri, 06 July 2012 13:37

Mike F.
Messages: 2
Registered: July 2012

Junior Member

Hello all.

I'm new to IDL (and coding in general), and I'm looking to find a more efficient way to generate an nxn array where each element is the distance from the center of the array.

3 x 3 Ex: 1.4 1 1.4
1 0 1
1.4 1 1.4

All I can think of on my own is a nested FOR loop as such:

FOR i = 0l, (n - 1) DO BEGIN
FOR j = 0l, (n - 1) DO BEGIN

plane[i,j] = SQRT( (i-n/2.)^2 + (j - n/2.)^2 )

ENDFOR
ENDFOR

From what I've read on IDL forums, nested FOR loops are the pinnacle of sin, and I'd like to be a bit more pious if possible.

Any tips would be appreciated!

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