[R] Statemement by recurrence avoiding loop

[Laurent Gautier]

Did you try 'cumsum' ?


Hopin' it helps,



L.


On Mon, Jul 08, 2002 at 09:47:10AM +0200, tlorino at vet-alfort.fr wrote:
> Dear R users,
> 
> I would like to calculate a cumulative sum as following: on the i-th row, in the
> j-th column of a matrix, I would like to obtain the sum of the (i-1) preceding elements of
> this j-th column.
> Could I avoid a "for" loop?
> 
> Thank you,
> Tristan Lorino
> 
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