remove_empty: Remove empty (all-zero) columns

In dmolitor/sparseprepr: Pre Processing for Sparse Matrices

Description

remove_empty() removes all-zero columns from sparse and dense matrices.

Usage

remove_empty(x)

## S3 method for class 'CsparseMatrix'
remove_empty(x)

## S3 method for class 'matrix'
remove_empty(x)

Arguments

x	A matrix or CsparseMatrix.

Details

remove_empty() is an S3 generic with methods for:

• CsparseMatrix

• matrix

Value

x with all-zero columns removed.

Examples

# Create a sparse matrix with constant columns
x <- Matrix::rsparsematrix(10, 3, 0.1)
x <- cbind(x, 0)
colnames(x) <- paste0("x", 1:4)
# Print x
x

# Same matrix in dense format
xdense <- as.matrix(x)

# Drop empty columns
remove_empty(x)
remove_empty(xdense)

dmolitor/sparseprepr documentation built on Jan. 7, 2022, 9:58 p.m.