https://github.com/cran/fBasics
Tip revision: 10e7dcd61579f351c254759feb7bd3ea2694e664 authored by Rmetrics Core Team on 08 August 1977, 00:00:00 UTC
version 290.75
version 290.75
Tip revision: 10e7dcd
matrixNorm.Rd
\name{norm}
\alias{norm}
\title{Matrix Norm}
\description{
Returns the norm of a matrix.
}
\usage{
norm(x, p = 2)
}
\arguments{
\item{x}{
a numeric matrix.
}
\item{p}{
an integer value, \code{1}, \code{2} or \code{Inf}.
\code{p=1} - The maximum absolute column sum norm which is defined
as the maximum of the sum of the absolute valued elements of columns
of the matrix.
\code{p=2} - The spectral norm is "the norm" of a matrix \code{X}.
This value is computed as the square root of the maximum eigenvalue
of \code{CX} where \code{C} is the conjugate transpose.
\code{p=Inf} - The maximum absolute row sum norm is defined
as the maximum of the sum of the absolute valued elements
of rows of the matrix.
}
}
\details{
The function \code{norm} computes the norm of a matrix. Three choices
are possible:
\code{p=1} - The maximum absolute column sum norm which is defined
as the maximum of the sum of the absolute valued elements of columns
of the matrix.
\code{p=2} - The spectral norm is "the norm" of a matrix \code{X}.
This value is computed as the square root of the maximum eigenvalue
of \code{CX} where \code{C} is the conjugate transpose.
\code{p=Inf} - The maximum absolute row sum norm is defined
as the maximum of the sum of the absolute valued elements
of rows of the matrix.
}
\references{
Golub, van Loan, (1996);
\emph{Matrix Computations},
3rd edition. Johns Hopkins University Press.
}
\examples{
## Create Pascal Matrix:
P = pascal(5)
P
## Return the Norm of the Matrix:
norm(P)
}
\keyword{math}