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num_tx
2009 Feb 16
3
Applying functions to partitions
Hi list! I have a large matrix which I'd like to partition into blocks
and for each block I'd like to compute the mean. Following a example
where each letter marks a block of the partition:
a a a d g g
a a a d g g
a a a d g g
b b b e h h
b b b e h h
c c c f i i
I'm only interested in the resulting matrix of means. How can this be
done efficiently?