On Tue, Nov 22, 2011 at 3:16 PM, Gábor Csárdi <csa...@rmki.kfki.hu> wrote: > Dear All, > > in some functions of my package, I use the Matrix S4 class, as defined > in the Matrix package. > > I don't want to depend on Matrix, however, because my package is > perfectly fine without Matrix, most of the functionality does not need > Matrix. Matrix is so included in the 'Suggests' line. > > I load Matrix via require(), from the functions that really need it. > This mostly works fine, but I have an issue now that I cannot sort > out. > > If I define a function like this in my package: > > f <- function() { > require(Matrix) > res <- sparseMatrix(dims=c(5, 5), i=1:5, j=1:5, x=1:5) > y <- rowSums(res) > res / y > } > > then calling it from the R prompt I get > Error in rowSums(res) : 'x' must be an array of at least two dimensions > > which basically means that the rowSums() in the base package is > called, not the S4 generic in the Matrix package. Why is that? > Is there any way to work around this problem, without depending on Matrix? > > I am doing this on R 2.14.0, x86_64-apple-darwin9.8.0. >
Try adding these three lines to the package: rowSums <- function(x, na.rm = FALSE, dims = 1L) UseMethod("rowSums") rowSums.dgCMatrix <- Matrix:::rowSums rowSums.default <- base::rowSums -- Statistics & Software Consulting GKX Group, GKX Associates Inc. tel: 1-877-GKX-GROUP email: ggrothendieck at gmail.com ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.