Hello, thank you very much for this solution, i'll try to adapt it to my
problem, i think i'll be able to. By the way, i wrote about a
"sliding-window" weight matrix, it's an expression used in satellite images
processing, esp. convolution filters, meaning that the main matrix is not
confronted to another one of the same dimensions, but to a much smaller one.
The calculus is executed value by value (pixels on an image), centering the
small matrix on each one, hence the name of sliding window.

Laurent

-- 
Laurent Jégou
Cartographe et enseignant
UTM - Dépt. Géographie
31058 TOULOUSE Cedex 9 - 05.61.50.43.89
http://www.univ-tlse2.fr/geoprdc

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