emptySparse: Create Empty Sparse Matrix

In MatrixExtra: Extra Methods for Sparse Matrices

Create Empty Sparse Matrix

Description

Creates an empty sparse matrix (all values being zeros) with the requested format and dimensions. This is a faster alternative to calling 'Matrix::Matrix(0, ...)'.

Usage

emptySparse(nrow = 0L, ncol = 0L, format = "R", dtype = "d")

Arguments

nrow	Desired number of rows for the matrix.
ncol	Desired number of columns for the matrix.
format	Storage format for the matrix. Options are: "R", which will output a CSR Matrix ("RsparseMatrix"). "C", which will output a CSC Matrix ("CsparseMatrix"). "T", which will output a COO/triplets Matrix ("TsparseMatrix").
dtype	Data type for the matrix. Options are: "d", which will output a numeric/double type (e.g. "dgRMatrix"). "l", which will output a logical/boolean type. "n", which will output a binary type.

Value

A sparse matrix of general type, with the specific class determined by 'format' and 'dtype'.

Examples

### This is very fast despite the large dimensions,
### as no data is held in the resulting object
library(MatrixExtra)
X <- emptySparse(nrow=2^20, ncol=2^25, format="T")

MatrixExtra documentation built on May 29, 2024, 2:53 a.m.