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Matrix (version 1.7-4)

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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Install

install.packages('Matrix')

Monthly Downloads

108,657

Version

1.7-4

License

GPL (>= 2) | file LICENCE

Maintainer

Martin Maechler

Last Published

August 28th, 2025

Functions in Matrix (1.7-4)

Koenker-Ng Example Sparse Model Matrix and Response Vector

Albers' example Matrix with "Difficult" Eigen Factorization

Generate a Hilbert matrix

Dense Cholesky Factorizations

BunchKaufman-methods

Methods for Bunch-Kaufman Factorization

CsparseMatrix-class

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

BunchKaufman-class

Dense Bunch-Kaufman Factorizations

CHMfactor-class

Sparse Cholesky Factorizations

Construct a Diagonal Matrix

Cholesky-methods

Methods for Cholesky Factorization

Defunct Functions in Package Matrix

The Matrix (Super-) Class of a Class

Matrix-deprecated

Deprecated Functions in Package Matrix

Virtual Classes Not Yet Really Implemented and Used

Khatri-Rao Matrix Product

Virtual Class "Matrix" of Matrices

Construct a Classed Matrix

Schur Factorizations

RsparseMatrix-class

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

MatrixFactorization-class

Virtual Class "MatrixFactorization" of Matrix Factorizations

Contiguity Matrix of U.S. Counties

TsparseMatrix-class

Class "TsparseMatrix" of Sparse Matrices in Triplet Form

Class "abIndex" of Abstract Index Vectors

Sequence Generation of "abIndex", Abstract Index Vectors

Standardize a Sparse Matrix in Triplet Format

Methods for Schur Factorization

Construct a Block Diagonal Matrix

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

all.equal-methods

Matrix Package Methods for Function all.equal()

Extract bands of a matrix

boolmatmult-methods

Boolean Arithmetic Matrix Products: %&% and Methods

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

ddenseMatrix-class

Virtual Class "ddenseMatrix" of Numeric Dense Matrices

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

Compute the Cholesky Factor of a Matrix

coerce-methods-SparseM

Sparse Matrix Coercion from and to those from package SparseM

coerce-methods-graph

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

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

chol2inv-methods

Inverse from Cholesky Factor

colSums-methods

Form Row and Column Sums and Means

denseMatrix-class

Virtual Class "denseMatrix" of All Dense Matrices

dgTMatrix-class

Sparse matrices in triplet form

Scale the Rows and Columns of a Matrix

dgeMatrix-class

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

Transform Triangular Matrices from Unit Triangular to General Triangular and Back

Dense LU Factorizations

ddiMatrix-class

Class "ddiMatrix" of Diagonal Numeric Matrices

dgRMatrix-class

Sparse Compressed, Row-oriented Numeric Matrices

diagonalMatrix-class

Class "diagonalMatrix" of Diagonal Matrices

dgCMatrix-class

Compressed, sparse, column-oriented numeric matrices

dtRMatrix-class

Triangular Sparse Compressed Row Matrices

dtCMatrix-class

Triangular, (compressed) sparse column matrices

dsCMatrix-class

Numeric Symmetric Sparse (column compressed) Matrices

Drop Non-Structural Zeros from a Sparse Matrix

dsyMatrix-class

Symmetric Dense (Packed or Unpacked) Numeric Matrices

dpoMatrix-class

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

dsRMatrix-class

Symmetric Sparse Compressed Row Matrices

dsparseMatrix-class

Virtual Class "dsparseMatrix" of Numeric Sparse Matrices

Dulmage-Mendelsohn Permutation / Decomposition

dtpMatrix-class

Packed Triangular Dense Matrices - "dtpMatrix"

Matrix Exponential

“Low Level” Coercions and Methods

forceSymmetric-methods

Force a Matrix to 'symmetricMatrix' Without Symmetry Checks

generalMatrix-class

Class "generalMatrix" of General Matrices

Methods for image() in Package 'Matrix'

Multiplication by Factors from Matrix Factorizations

Expand Matrix Factorizations

dtrMatrix-class

Triangular, dense, numeric matrices

Formatting Sparse Numeric Matrices Utilities

externalFormats

Read and write external matrix formats

isSymmetric-methods

Methods for Function 'isSymmetric' in Package 'Matrix'

Utilities for Permutation Vectors

kronecker-methods

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

isTriangular-methods

Test whether a Matrix is Triangular or Diagonal

indMatrix-class

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

ldenseMatrix-class

Virtual Class "ldenseMatrix" of Dense Logical Matrices

Are the Dimnames dn NULL-like ?

Virtual Class “index” of Index Vectors

ldiMatrix-class

Class "ldiMatrix" of Diagonal Logical Matrices

Map Matrix to its Triplet Representation

lgeMatrix-class

Class "lgeMatrix" of General Dense Logical Matrices

Class "nMatrix" of Non-zero Pattern Matrices

Methods for LU Factorization

lsparseMatrix-class

Sparse logical matrices

matmult-methods

Matrix (Cross) Products (of Transpose)

Nearest Positive Definite Matrix

ltrMatrix-class

Triangular Dense Logical Matrices

lsyMatrix-class

Symmetric Dense Logical Matrices

ndenseMatrix-class

Virtual Class "ndenseMatrix" of Dense Logical Matrices

Representation of Packed and Unpacked Dense Matrices

Permutation matrices

packedMatrix-class

Virtual Class "packedMatrix" of Packed Dense Matrices

nsparseMatrix-class

Sparse "pattern" Matrices

ntrMatrix-class

Triangular Dense Logical Matrices

The Number of Non-Zero Values of a Matrix

ngeMatrix-class

Class "ngeMatrix" of General Dense Nonzero-pattern Matrices

nsyMatrix-class

Symmetric Dense Nonzero-Pattern Matrices

Format and Print Sparse Matrices Flexibly

Replicate Vectors into 'abIndex' Result

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

Sparse Matrix Constructor From Triplet

Methods for QR Factorization

Rank of a Matrix

Sparse LU Factorizations

sparse.model.matrix

Construct Sparse Design / Model Matrices

Random Sparse Matrix

Estimate the Reciprocal Condition Number

Methods in Package Matrix for Function solve

symmetricMatrix-class

Virtual Class of Symmetric Matrices in Package Matrix

triangularMatrix-class

Virtual Class of Triangular Matrices in Package Matrix

subscript-methods

Methods for "[": Extraction or Subsetting in Package 'Matrix'

Sparse Vector Construction from Nonzero Entries

Sparse QR Factorizations

subassign-methods

Methods for "[<-" - Assigning to Subsets for 'Matrix'

sparseMatrix-class

Virtual Class "sparseMatrix" --- Mother of Sparse Matrices

sparseVector-class

Sparse Vector Classes

Contiguity Matrix of World One-Degree Grid Cells

unpackedMatrix-class

Virtual Class "unpackedMatrix" of Unpacked Dense Matrices

symmpart-methods

Symmetric Part and Skew(symmetric) Part of a Matrix

General Sparse Matrix Construction from Nonzero Entries

Updating and Downdating Sparse Cholesky Factorizations