create a SparseplusLowRank object

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Description

create an object of class SparseplusLowRank which can be efficiently stored and for which efficient linear algebra operations are possible.

Usage

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splr(x, a = NULL, b = NULL)

Arguments

x

sparse matrix with dimension say m x n

a

matrix with m rows and number of columns r less than min(dim(x))

b

matrix with n rows and number of columns r less than min(dim(x))

Value

an object of S4 class SparseplusLowRank is returned with slots x, a and b

Author(s)

Trevor Hastie

See Also

SparseplusLowRank-class, softImpute

Examples

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x=matrix(sample(c(3,0),15,replace=TRUE),5,3)
x=as(x,"sparseMatrix")
a=matrix(rnorm(10),5,2)
b=matrix(rnorm(6),3,2)
new("SparseplusLowRank",x=x,a=a,b=b)
splr(x,a,b)