[R] Statemement by recurrence avoiding loop

[Shawn Lee]

Please check the ?cumsum.

cumsum[x[,,j])[i]

Kind Regards, Shawn Lee


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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