sparse.matrixfree {bigQF}

Make 'matrix-free' object from (sparse) Matrix

Description

Packages a matrix (which will typically be a sparse Matrix) for 'matrix-free' or 'implicit' stochastic SVD.

Usage

sparse.matrixfree(M)

Arguments

M

A matrix or Matrix

Value

Object of class 'matrixfree', with components

mult

Function to multiply by M

tmult

Function to multiply by t(M)

trace

trace of t(M)%*%M, needed for pQF

ncol

dimensions of M

nrow

dimensions of M

Author(s)

Thomas Lumley

See Also

pQF,link{seigen},ssvd, SKAT.matrixfree

Examples

data(sequence)
Msp<-sparse.matrixfree(sequence)
ssvd(Msp,n=10)


## this is slow, don't run it
svd(sequence,nu=0,nv=0)$d[1:10]