Array neighbourhoods

[Daniel Pryde]

Hi again.

One thing I forgot to include in my post the other day. I was wondering if 
anyone knew of any fast algorithms for returning the surrounding neighbours 
of an array element, or even the neighbours of a group of array elements.

I'm using a function which affects neighbourhoods of a value with a 
diminishing effect (i.e. a gaussian distribution), so I need to be able to 
get the neighbourhood (of size 1) of the first array entry, as well as the 
neighbourhood of the returned neighbourhoods! Hope that all makes sense.

Daniel

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