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Matrix (version 1.7-6)

Sparse and Dense Matrix Classes and Methods

Description

A rich hierarchy of sparse and dense matrix classes, including general, symmetric, triangular, and diagonal matrices with numeric, logical, or pattern entries. Efficient methods for operating on such matrices, often wrapping the 'BLAS', 'LAPACK', and 'SuiteSparse' libraries.

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Version

Install

install.packages('Matrix')

Monthly Downloads

153,963

Version

1.7-6

License

GPL (>= 2) | file LICENCE

Maintainer

Martin Maechler

Last Published

July 25th, 2026

Functions in Matrix (1.7-6)

CsparseMatrix-class

Class "CsparseMatrix" of Sparse Matrices in Column-compressed Form

Dense Cholesky Factorizations

Albers' example Matrix with "Difficult" Eigen Factorization

Koenker-Ng Example Sparse Model Matrix and Response Vector

BunchKaufman-methods

Methods for Bunch-Kaufman Factorization

CHMfactor-class

Sparse Cholesky Factorizations

Construct a Diagonal Matrix

Generate a Hilbert matrix

BunchKaufman-class

Dense Bunch-Kaufman Factorizations

Cholesky-methods

Methods for Cholesky Factorization

Defunct Functions in Package Matrix

Matrix-deprecated

Deprecated Functions in Package Matrix

The Matrix (Super-) Class of a Class

Khatri-Rao Matrix Product

RsparseMatrix-class

Class "RsparseMatrix" of Sparse Matrices in Row-compressed Form

Construct a Classed Matrix

Virtual Classes Not Yet Really Implemented and Used

Virtual Class "Matrix" of Matrices

MatrixFactorization-class

Virtual Class "MatrixFactorization" of Matrix Factorizations

Schur Factorizations

Standardize a Sparse Matrix in Triplet Format

Construct a Block Diagonal Matrix

Sequence Generation of "abIndex", Abstract Index Vectors

TsparseMatrix-class

Class "TsparseMatrix" of Sparse Matrices in Triplet Form

Methods for Schur Factorization

all.equal-methods

Matrix Package Methods for Function all.equal()

Extract bands of a matrix

Class "abIndex" of Abstract Index Vectors

Contiguity Matrix of U.S. Counties

Construct Sparse Banded Matrix from (Sup-/Super-) Diagonals

boolmatmult-methods

Boolean Arithmetic Matrix Products: %&% and Methods

coerce-methods-graph

Conversions "graph" <--> (sparse) Matrix

ddenseMatrix-class

Virtual Class "ddenseMatrix" of Numeric Dense Matrices

coerce-methods-SparseM

Sparse Matrix Coercion from and to those from package SparseM

(Virtual) Class "dMatrix" of "double" Matrices

chol2inv-methods

Inverse from Cholesky Factor

'cbind()' and 'rbind()' recursively built on cbind2/rbind2

Compute the Cholesky Factor of a Matrix

dgTMatrix-class

Sparse matrices in triplet form

dgRMatrix-class

Sparse Compressed, Row-oriented Numeric Matrices

denseMatrix-class

Virtual Class "denseMatrix" of All Dense Matrices

dgCMatrix-class

Compressed, sparse, column-oriented numeric matrices

diagonalMatrix-class

Class "diagonalMatrix" of Diagonal Matrices

Scale the Rows and Columns of a Matrix

ddiMatrix-class

Class "ddiMatrix" of Diagonal Numeric Matrices

Dense LU Factorizations

dgeMatrix-class

Class "dgeMatrix" of Dense Numeric (S4 Class) Matrices

Transform Triangular Matrices from Unit Triangular to General Triangular and Back

Compute Approximate CONDition number and 1-Norm of (Large) Matrices

colSums-methods

Form Row and Column Sums and Means

Drop Non-Structural Zeros from a Sparse Matrix

dtCMatrix-class

Triangular, (compressed) sparse column matrices

dsRMatrix-class

Symmetric Sparse Compressed Row Matrices

dpoMatrix-class

Positive Semi-definite Dense (Packed | Non-packed) Numeric Matrices

Dulmage-Mendelsohn Permutation / Decomposition

dtRMatrix-class

Triangular Sparse Compressed Row Matrices

dsCMatrix-class

Numeric Symmetric Sparse (column compressed) Matrices

dtpMatrix-class

Packed Triangular Dense Matrices - "dtpMatrix"

dsparseMatrix-class

Virtual Class "dsparseMatrix" of Numeric Sparse Matrices

dsyMatrix-class

Symmetric Dense (Packed or Unpacked) Numeric Matrices

dtrMatrix-class

Triangular, dense, numeric matrices

generalMatrix-class

Class "generalMatrix" of General Matrices

Matrix Exponential

Expand Matrix Factorizations

forceSymmetric-methods

Force a Matrix to 'symmetricMatrix' Without Symmetry Checks

Multiplication by Factors from Matrix Factorizations

externalFormats

Read and write external matrix formats

Formatting Sparse Numeric Matrices Utilities

Virtual Class “index” of Index Vectors

isTriangular-methods

Test whether a Matrix is Triangular or Diagonal

kronecker-methods

Methods for Function 'kronecker()' in Package 'Matrix'

indMatrix-class

Utilities for Permutation Vectors

is.na(), is.finite() Methods for 'Matrix' Objects

ltrMatrix-class

Triangular Dense Logical Matrices

Map Matrix to its Triplet Representation

Nearest Positive Definite Matrix

Methods for LU Factorization

matmult-methods

Matrix (Cross) Products (of Transpose)

ntrMatrix-class

Triangular Dense Logical Matrices

Representation of Packed and Unpacked Dense Matrices

The Number of Non-Zero Values of a Matrix

nsyMatrix-class

Symmetric Dense Nonzero-Pattern Matrices

Permutation matrices

Methods in Package Matrix for Function solve

Class "rleDiff" of rle(diff(.)) Stored Vectors

Estimate the Reciprocal Condition Number

Methods for QR Factorization

sparse.model.matrix

Construct Sparse Design / Model Matrices