The matrix z is save()d in <http://sds.podval.org/data/z>.
It is a product of a sparse matrix and a non-sparse matrix.
I need to scale it and write to a file in the sparse format for libsvm.
platform x86_64-pc-linux-gnu
arch x86_64
os linux-gnu
system x86_64, linux-gnu
status
major 2
minor 15.2
year 2012
month 10
day 26
svn rev 61015
language R
version.string R version 2.15.2 (2012-10-26)
Package: SparseM
Version: 0.96
Author: Roger Koenker <rkoen...@uiuc.edu> and Pin Ng
<pin...@nau.edu>
Maintainer: Roger Koenker <rkoen...@uiuc.edu>
Depends: R (>= 2.4.1), methods, stats, utils
Description: Basic linear algebra for sparse matrices
License: GPL (>= 2)
Title: Sparse Linear Algebra
URL: http://www.econ.uiuc.edu/~roger/research/sparse/sparse.html
Packaged: 2012-03-18 19:39:05 UTC; root
Repository: CRAN
Date/Publication: 2012-03-18 20:55:08
Built: R 2.15.2; x86_64-pc-linux-gnu; 2012-11-05 17:46:36
UTC; unix
> * Sam Steingold <f...@tah.bet> [2012-11-05 12:40:25 -0500]:
>
> all of a sudden, after a SparseM upgrade(?)
> I get this error:
>> str(z)
> Formal class 'matrix.csr' [package "SparseM"] with 4 slots
> ..@ ra : num [1:85372672] -0.4288 0.0397 0.0104 -0.1843 -0.1203 ...
> ..@ ja : int [1:85372672] 1 2 3 4 5 6 7 8 9 10 ...
> ..@ ia : int [1:699777] 1 123 245 367 489 611 733 855 977 1099 ...
> ..@ dimension: int [1:2] 699776 122
>> z1<-as.matrix(z)
> Error in as.vector(data) :
> no method for coercing this S4 class to a vector
>> z1<-scale(z)
> Error in as.vector(data) :
> no method for coercing this S4 class to a vector
>
> what has happened?
> how do I scale the matrix.csr object (to be written to a file)?
>
> PS. write.matrix.csr is very slow: it takes
> user system elapsed
> 1137.058 510.615 1649.925
> to write the matrix "z" above.
>
> thanks!
--
Sam Steingold (http://sds.podval.org/) on Ubuntu 12.04 (precise) X 11.0.11103000
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