Hi, I'd like to simply add column-wise using Matrix objects (Csparse). It looks like one can apply mosty any base function to these objects (i.e., apply, colSums), but there is a nasty conversion to traditional matrix objects if one does that. Is there any workaround? I can see colSum listed in the help for Class 'CsparseMatrix' , but I wonder whether I'm using the default colSums() or the one specific to CsparseMatrix...
#example (z = Matrix(c(0,1,0,0), 10,10)) zr = rowSums(z) class(zr) # numeric; I'd like it to be a CSparseMatrix object Thanks a lot in advance, -Jose -- Jose Quesada, PhD. http://www.andrew.cmu.edu/~jquesada ______________________________________________ R-help@stat.math.ethz.ch 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.
