Incomplete {softImpute}

create a matrix of class Incomplete

Description

creates an object of class Incomplete, which inherits from class dgCMatrix, a specific instance of class sparseMatrix

Usage

Incomplete(i, j, x)

Arguments

i

row indices

j

column indices

x

a vector of values

Details

The matrix is represented in sparse-matrix format, except the "zeros" represent missing values. Real zeros are represented explicitly as values.

Value

a matrix of class Incomplete which inherits from class dgCMatrix

Author(s)

Trevor Hastie and Rahul Mazumder

See Also

softImpute

Examples

set.seed(101)
n=200
p=100
J=50
np=n*p
missfrac=0.3
x=matrix(rnorm(n*J),n,J)%*%matrix(rnorm(J*p),J,p)+matrix(rnorm(np),n,p)/5
ix=seq(np)
imiss=sample(ix,np*missfrac,replace=FALSE)
xna=x
xna[imiss]=NA
xnaC=as(xna,"Incomplete")
### here we do it a different way to demonstrate Incomplete
### In practise the observed values are stored in this market-matrix format.
i = row(xna)[-imiss]
j = col(xna)[-imiss]
xnaC=Incomplete(i,j,x=x[-imiss])