Re: [R] column permutation of sparse matrix

Sorry. I erred somewhere in making the original M1 matrix using sampling call in the spMatrix function. I still don't really understand why the matrix values do not match exactly with M1@x. If I regenerate M1 this way... i=c(1:5,5:1) j=c(1:5,2:6) x=rnorm(10,2) M1 -

[R] ff object in lapply function

Hello. I'm using as.ffdf(mydataframe) to create ffdf objects inside an lapply loop and returning that. I then use crbind to combine the lapply results into allData. So...simplified flow looks like this. res - lapply(1:nchunks, function(n) { blah blah with nth chunk

Re: [R] column permutation of sparse matrix

values. I'll try to see how I can combine these 2 ideas but it's not immediately obvious to me. =} -khai -- View this message in context: http://r.789695.n4.nabble.com/column-permutation-of-sparse-matrix-tp4216726p4219031.html Sent from the R help mailing list archive at Nabble.com

[R] column permutation of sparse matrix

Hi, I'm very new to working with sparse matrices and would like to know how I can column permute a sparse matrix. Here is a small example: M1 - spMatrix(nrow=5,ncol=6,i=sample(5,15,replace=TRUE),j=sample(6,15,replace=TRUE),x=round_any(rnorm(15,2),0.001)) M1 5 x 6 sparse Matrix of class

[R] Come join me on MaLaYsiaN BesT…

://malaysianbest.ning.com/?xgi=3hLsp9Y Thanks, khai __ 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