[Rd] rowSums, rowMean and rowCumSums?

[Felix Andrews]

Hi,
you can compute cumsums for each row with
t(apply(x, 1, cumsum))
As this is a simple, direct implementation, I see no reason to make it
a named function.

Cheers
-Felix


2009/7/31 Christophe Dutang <dutangc at gmail.com>:
> Dear list,
>
> Don't you think it could be useful to have in R base a function
> rowCumSums, that compute cumulative sums for each row of a matrix?
>
> My implementation of rowCumSums is
>
> rowCumSums <- function(x) t(mapply(function(row)cumsum(x[row,]),
> 1:NROW(x)))
>
> I'm sure it can be improved to have other arguments like na.rm or dims.
>
> Is there any hope to have this function in R?
>
> Christophe
>
> --
> Christophe Dutang
> Ph.D. student at ISFA, Lyon, France
> website: http://dutangc.free.fr
>
>
>
>
>
>
>
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-- 
Felix Andrews / 安福立
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