qr-methods {Matrix} | R Documentation |
The "Matrix"
package provides methods for the QR decomposition
of special classes of matrices. The generic function is
qr
but methods defined in this package can take
extra arguments. In particular there is an option for determining a
fill-reducing permutation of the columns of a sparse, rectangular matrix.
nrow(x) >= ncol(x)
. Returns
an object of class "sparseQR"
, see
sparseQR
.