Ken wrote:
> 
> What is "sparse data" ?

A matrix where only "some" data points are occupied. Depending
on how much data points are available, it might be more economic
to not store the matrix as e.g.

0 0 0 0 1 0
0 1 0 0 0 0
0 0 0 1 0 0

but as:

(1,5),(2,2),(3,4).

Markus
-- 

 Ich nicht eine Sekunde!!!" H. Heinol in Val Thorens

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