Hi all, I used sparseM package for creating sparse Matrix and followed below commands.
The sequence of commands are: >ex <- read.table('fileName',sep=',') > M <- as.matrix.csr(0,22638,80914) >for (i in 1:nrow(ex)) { M[ex[i,1],ex[i,2]]<-ex[i,3]} Even after 4 hours, I can still see the above command running. But, I am not sure whether it got stuck some where. Also, when I initialize matrix M and try to display the values, I can see something like this [1] 1 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 [85] 2 2 And, after I stopped executing above initialize command from table(after 4 hours). I could see a different values. Could some one kindly explain what these number are about and how can I test that my command is running and not just stuck some where. Also, it would be great if some one point me to a tutorial if any on sparse matricies on R as I couldn't get one from internet. Thanks Pallavi Pallavi Palleti wrote: > > Hi David, > > Thanks for your help. This is exactly what I want. > But, I have number of rows of my matrix = 25k and columns size as 80k. So, > when I define a matrix object, it is throwing an error saying can not > allocate a vector of length (25K * 80k). I heard that, this data can still > be loaded into R using sparseMatrix. However, I couldn't get a syntax for > creating the same. Could someone kindly help me in this regard. > > Thanks > Pallavi > > > David Winsemius wrote: >> >> >> On Oct 26, 2009, at 5:06 AM, Pallavi Palleti wrote: >> >>> >>> Hi all, >>> >>> I am new to R and learning the same. I would like to create a sparse >>> matrix >>> from an existing file whose contents are in the format >>> "rowIndex,columnIndex,value" >>> >>> for ex: >>> 1,2,14 >>> 2,4,15 >>> >>> I would like to create a sparse matrix by taking the above as input. >>> However, I couldn't find an example where the data was being read >>> from a >>> file. I tried searching in R tutorial and also searched for the same >>> in web >>> but in vain. Could some one kindly help me how to give the above >>> format as >>> input in R to create a sparse matrix. >> >> ex <- read.table(textConnection("1,2,14 >> 2,4,15") , sep=",") >> ex >> # V1 V2 V3 >> #1 1 2 14 >> #2 2 4 15 >> >> M <- Matrix(0, 20, 20) >> >> > M >> #20 x 20 sparse Matrix of class "dsCMatrix" >> >> [1,] . . . . . . . . . . . . . . . . . . . . >> [2,] . . . . . . . . . . . . . . . . . . . . >> [3,] . . . . . . . . . . . . . . . . . . . . >> snip >> >> for (i in 1:nrow(ex) ) { M[ex[i, 1], ex[i, 2] ] <- ex[i, 3] } >> >> > M >> 20 x 20 sparse Matrix of class "dgCMatrix" >> >> [1,] . 14 . . . . . . . . . . . . . . . . . . >> [2,] . . . 15 . . . . . . . . . . . . . . . . >> [3,] . . . . . . . . . . . . . . . . . . . . >> snip >> > >> -- >> >> David Winsemius, MD >> Heritage Laboratories >> West Hartford, CT >> >> ______________________________________________ >> 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. >> >> > > -- View this message in context: http://www.nabble.com/Creating-a-sparse-matrix-from-a-file-tp26056334p26075036.html Sent from the R help mailing list archive at Nabble.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.