% Generated by roxygen2: do not edit by hand
% Please edit documentation in R/ggplot.R, R/plot.train.R
\name{ggplot.train}
\alias{ggplot.train}
\alias{plot.train}
\title{Plot Method for the train Class}
\usage{
\method{ggplot}{train}(
  data = NULL,
  mapping = NULL,
  metric = data$metric[1],
  plotType = "scatter",
  output = "layered",
  nameInStrip = FALSE,
  highlight = FALSE,
  ...,
  environment = NULL
)

\method{plot}{train}(
  x,
  plotType = "scatter",
  metric = x$metric[1],
  digits = getOption("digits") - 3,
  xTrans = NULL,
  nameInStrip = FALSE,
  ...
)
}
\arguments{
\item{data}{an object of class \code{\link{train}}.}

\item{mapping, environment}{unused arguments to make consistent with
\pkg{ggplot2} generic method}

\item{metric}{What measure of performance to plot. Examples of possible
values are "RMSE", "Rsquared", "Accuracy" or "Kappa". Other values can be
used depending on what metrics have been calculated.}

\item{plotType}{a string describing the type of plot (\code{"scatter"},
\code{"level"} or \code{"line"} (\code{plot} only))}

\item{output}{either "data", "ggplot" or "layered". The first returns a data
frame while the second returns a simple \code{ggplot} object with no layers.
The third value returns a plot with a set of layers.}

\item{nameInStrip}{a logical: if there are more than 2 tuning parameters,
should the name and value be included in the panel title?}

\item{highlight}{a logical: if \code{TRUE}, a diamond is placed around the
optimal parameter setting for models using grid search.}

\item{\dots}{\code{plot} only: specifications to be passed to
\code{\link[lattice]{levelplot}}, \code{\link[lattice]{xyplot}},
\code{\link[lattice:xyplot]{stripplot}} (for line plots). The function
automatically sets some arguments (e.g. axis labels) but passing in values
here will over-ride the defaults}

\item{x}{an object of class \code{\link{train}}.}

\item{digits}{an integer specifying the number of significant digits used to
label the parameter value.}

\item{xTrans}{a function that will be used to scale the x-axis in scatter
plots.}
}
\description{
This function takes the output of a \code{\link{train}} object and creates a
line or level plot using the \pkg{lattice} or \pkg{ggplot2} libraries.
}
\details{
If there are no tuning parameters, or none were varied, an error is
produced.

If the model has one tuning parameter with multiple candidate values, a plot
is produced showing the profile of the results over the parameter. Also, a
plot can be produced if there are multiple tuning parameters but only one is
varied.

If there are two tuning parameters with different values, a plot can be
produced where a different line is shown for each value of of the other
parameter. For three parameters, the same line plot is created within
conditioning panels/facets of the other parameter.

Also, with two tuning parameters (with different values), a levelplot (i.e.
un-clustered heatmap) can be created. For more than two parameters, this
plot is created inside conditioning panels/facets.
}
\examples{


\dontrun{
library(klaR)
rdaFit <- train(Species ~ .,
                data = iris,
                method = "rda",
                control = trainControl(method = "cv"))
plot(rdaFit)
plot(rdaFit, plotType = "level")

ggplot(rdaFit) + theme_bw()

}

}
\references{
Kuhn (2008), ``Building Predictive Models in R Using the caret''
(\doi{10.18637/jss.v028.i05})
}
\seealso{
\code{\link{train}}, \code{\link[lattice]{levelplot}},
\code{\link[lattice]{xyplot}}, \code{\link[lattice:xyplot]{stripplot}},
\code{\link[ggplot2]{ggplot}}
}
\author{
Max Kuhn
}
\keyword{hplot}