Write a compressed MatrixMarket file

This function writes a sparse matrix in the MatrixMarket format to a compressed .gz file. The function handles both real and integer matrix types.

Usage

writeMMgz(x, file)

Arguments

x

A sparse matrix (typically a dgCMatrix or ngCMatrix object).

file

A character string specifying the output file name, which will be compressed into .gz format.

Value

This function does not return a value. It writes a file as a side effect.

Details

This function writes the matrix in the MatrixMarket coordinate format. It first writes the header indicating the matrix type and size, and then appends the matrix data. If the matrix is an ngCMatrix, it is treated as an integer matrix, otherwise as a real matrix. The function compresses the output into a .gz file.

Examples

if (FALSE) {
library(Matrix)
m <- Matrix(c(0, 1, 0, 2), 2, 2, sparse = TRUE)
writeMMgz(m, "matrix.mtx.gz")
}