kronecker {spam}R Documentation

Kronecker products on sparse matrices

Description

Computes the generalised kronecker product of two arrays, X and Y.

Usage

kronecker.spam(X, Y, FUN = "*", make.dimnames = FALSE, ...)

Arguments

X sparse matrix of class spam, a vector or a matrix.
Y sparse matrix of class spam, a vector or a matrix.
FUN a function; it may be a quoted string. See details
make.dimnames Provide dimnames that are the product of the dimnames of 'X' and 'Y'.
... optional arguments to be passed to FUN.

Details

The sparseness structure is determined by the ordinary %x%. Hence, the result of kronecker(X, Y, FUN = "+") is different depending on the input.

Value

An array A with dimensions dim(X) * dim(Y).

Author(s)

Reinhard Furrer

Examples

# Starting with non-spam objects, we get a spam matrix
kronecker.spam( diag(2), array(1:4,c(2,2)))

kronecker( diag.spam(2), array(1:4,c(2,2)))

# Notice the preservation of sparseness structure: 
kronecker( diag.spam(2), array(1:4,c(2,2)),FUN="+")
[Package spam version 0.15-3 Index]