compositions (version 2.0-4)

matmult: inner product for matrices and vectors

Description

Multiplies two matrices, if they are conformable. If one argument is a vector, it will be coerced to either a row or a column matrix to make the two arguments conformable. If both are vectors it will return the inner product.

Usage

x %*% y
# S3 method for default
%*%(x, y)

Value

The matrix product. Uses 'drop' to get rid of dimensions which have only one level.

Arguments

x,y

numeric or complex matrices or vectors

Author

K.Gerald v.d. Boogaart http://www.stat.boogaart.de

Details

This is a copy of the base::%*% function. The function is made generic to allow the definition of specific methods.

See Also

%*%.rmult

Examples

M <- matrix(c(
0.2,0.1,0.0,
0.1,0.2,0.0,
0.0,0.0,0.2),byrow=TRUE,nrow=3)
x <- c(1,1,2)
M %*% x
x %*% M
x %*% x
M %*% M
t(x) %*% M