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 <duta...@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 > > > > > > > > [[alternative HTML version deleted]] > > ______________________________________________ > R-devel@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-devel > -- Felix Andrews / 安福立 Postdoctoral Fellow Integrated Catchment Assessment and Management (iCAM) Centre Fenner School of Environment and Society [Bldg 48a] The Australian National University Canberra ACT 0200 Australia M: +61 410 400 963 T: + 61 2 6125 1670 E: felix.andr...@anu.edu.au CRICOS Provider No. 00120C -- http://www.neurofractal.org/felix/ ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
