Matrix {matsbyname}

Create a Matrix amenable to use in the matsbyname package

Description

The matsbyname package uses Matrix objects for its default data representation, taking advantage of the sparse matrix capabilities of Matrix compared to the base matrix class. This function routes to Matrix::Matrix(), with some important differences. See details.

Usage

Matrix(
  data = NA,
  nrow = 1,
  ncol = 1,
  byrow = FALSE,
  dimnames = base::dimnames(data),
  sparse = NULL,
  doDiag = FALSE,
  forceCheck = FALSE,
  rowtype = matsbyname::rowtype(data),
  coltype = matsbyname::coltype(data)
)

Arguments

data

An optional numeric data vector or matrix.

nrow

When data is not a matrix or a Matrix, the desired number of rows. Default is 1.

ncol

When data is not a matrix or a Matrix, the desired number of columns. Default is 1.

byrow

A boolean. If FALSE (the default) the Matrix is filled by columns, otherwise the Matrix is filled by rows.

dimnames

A dimnames attribute for the Matrix: a list of two character components. Default is base::dimnames(data).

sparse

A boolean or NULL. Specifies whether the result should be sparse or not. By default (NULL), the Matrix is made sparse when more than half of the entries are 0.

doDiag

A boolean indicating if a diagonalMatrix object should be returned when the resulting Matrix is diagonal (mathematically). Default is FALSE, which is different from Matrix::Matrix().

forceCheck

A boolean indicating if the checks for structure should happen when data is already a Matrix object. Default is FALSE.

rowtype

The rowtype for the result. Default is matsbyname::rowtype(data).

coltype

The coltype for the result. Default is matsbyname::coltype(data).

Details

This function NEVER creates a symmetric matrix (e.g., dsCMatrix, dsyMatrix, dsRMatrix, lsyMatrix, nsyMatrix), because symmetric matrices do not respect some future changes to dimnames, which can cause information loss in the matsbyname context. A non-symmetric Matrix is assured by calling as(out, "generalMatrix") on the outgoing Matrix object.

This function enables setting row and column types at the time of construction with the rowtype and coltype arguments.

This function has different defaults compared to Matrix::Matrix(), including

• Here, the default for doDiag is FALSE, while the default for doDiag is TRUE for Matrix::Matrix().

• Preserves rowtype and coltype on data.

This function is vectorized over a list of matrix objects supplied to data. See examples.

Value

A Matrix object.

Examples

# matsbyname::Matrix() will not create a Matrix with a symmetric subclass.
# dgCMatrix is a general matrix.
matsbyname::Matrix(c(1, 0, 2, 
                     0, 0, 0, 
                     2, 0, 0), byrow = TRUE, nrow = 3, ncol = 3)
# But Matrix::Matrix() will create a symmetric matrix.
# dsCMatrix is a symmetric matrix.
Matrix::Matrix(c(1, 0, 2, 
                 0, 0, 0, 
                 2, 0, 0), byrow = TRUE, nrow = 3, ncol = 3)
# matsbyname::Matrix() will not create a diagonal matrix.
# dgeMatrix is a general matrix.
matsbyname::Matrix(c(1, 0, 
                     0, 1), byrow = TRUE, nrow = 2, ncol = 2)
# But Matrix::Matrix() will create a diagonal matrix.
# ddiMatrix is a diagonal matrix.
Matrix::Matrix(c(1, 0, 
                 0, 1), byrow = TRUE, nrow = 2, ncol = 2)
# This function is vectorized over lists of `matrix` objects in `data`.
m <- matrix(c(1, 0, 2, 
              0, 0, 0, 
              2, 0, 0), byrow = TRUE, nrow = 3, ncol = 3)
matsbyname::Matrix(list(m, m))