Revision 04bbc417cf2927b827660bc07743429783569aec authored by HwB on 10 February 2013, 00:00:00 UTC, committed by Gabor Csardi on 10 February 2013, 00:00:00 UTC
1 parent 0e3ae6b
rot90.Rd
\name{rot90}
\alias{rot90}
\title{Matrix Rotation}
\description{
Rotate matrices for 90, 180, or 270 degrees..
}
\usage{
rot90(a, k = 1)
}
\arguments{
\item{a}{numeric or complex matrix}
\item{k}{scalar integer number of times the matrix will be rotated for
90 degrees; may be negative.}
}
\details{
Rotates a numeric or complex matrix for 90 (k = 1), 180 (k = 2) or
270 (k = 3 or k = -1) degrees.
Value of k is taken mod 4.
}
\value{
the original matrix rotated
}
\examples{
a <- matrix(1:12, nrow=3, ncol=4, byrow=TRUE)
rot90(a)
rot90(a, 2)
rot90(a, -1)
}
\keyword{ manip }
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