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% file class/man/somgrid.Rd
% copyright (C) 2002 W. N. Venables and B. D. Ripley
%
\name{somgrid}
\alias{somgrid}
\alias{plot.somgrid}
\alias{plot.SOM}
\title{
Plot SOM Fits
}
\description{
Plotting functions for SOM results.
}
\usage{
somgrid(xdim = 8, ydim = 6, topo = c("rectangular", "hexagonal"))
\method{plot}{somgrid}(x, type = "p", ...)
\method{plot}{SOM}(x, ...)
}
\arguments{
\item{xdim, ydim}{dimensions of the grid}
\item{topo}{the topology of the grid.}
\item{x}{an object inheriting from class \code{"somgrid"} or \code{"SOM"}.}
\item{type, \dots}{graphical parameters.}
}
\value{
For \code{somgrid}, an object of class \code{"somgrid"}, a list with
components
\item{pts}{a two-column matrix giving locations for the grid points.}
\item{xdim, ydim, topo}{as in the arguments to \code{somgrid}.}
}
\details{
The class \code{"somgrid"} records the coordinates of the grid to be
used for (batch or on-line) SOM: this has a plot method.
The plot method for class \code{"SOM"} plots a \code{\link{stars}}
plot of the representative at each grid point.
}
\references{
Venables, W. N. and Ripley, B. D. (2002)
\emph{Modern Applied Statistics with S.} Fourth edition. Springer.
}
\seealso{
\code{\link{batchSOM}}, \code{\link{SOM}}
}
\keyword{classif}
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