[R] Statemement by recurrence avoiding loop

[Anders Nielsen]

Hi Tristan  

I think the following solves most of your
problem  

Kind regards, 

Anders. 

> x<-matrix(1:9,3)
> apply(x,2,cumsum)
     [,1] [,2] [,3]
[1,]    1    4    7
[2,]    3    9   15
[3,]    6   15   24



On Mon, 2002-07-08 at 09:47, 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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