\name{drplot}
\alias{drplot}
\title{Plot dose-response models}
\description{
	Produce graphics of dose-response data and dose-response relationships 
  either combined or separately, for one or more substances.
}
\usage{
  drplot(drresults, data, dtype, alpha, path, fileprefix, overlay,
    postscript, color, datacolors, fitcolors)
}
\arguments{
  \item{drresults}{
    A data frame as returned from \code{\link{drfit}}.
    }
  \item{data}{ 
    A data frame as returned from \code{\link{drdata}}.  If data is to be
    plotted, the data frame has to contain at least a factor called
    "substance", a vector called "unit" containing the unit used for the dose,
    a column "response" with the response values of the test system normalized
    between 0 and 1, a column "dose" with the numeric dose values and a factor
    called "dosefactor" containing the dose as a factor. If plotting of the data is 
    not required, data can be set to FALSE.
    }
  \item{dtype}{
    A string describing if the raw data should be plotted ("raw"), or 
    an error bar should be constructed from the standard deviations of the
    responses at each dose level ("std", default value) or from the confidence
    intervals ("conf"). Of course, dtype only makes a difference, if a valid data
    object has been referenced.
    }
  \item{alpha}{
    The confidence level, defaulting to 0.95, only used if dtype "conf" has been
    chosen.
    }
  \item{path}{
    The path where graphic files should be put if any are produced. Defaults
    to "./" i.e. the current working directory of R.
    }
  \item{fileprefix}{
    A string which will form the beginning of each filename, if graphic files are 
    created. Defaults to "drplot".
    }
  \item{overlay}{
    If TRUE, all output will be put into one graph, otherwise a separate graph
    will be created for each substance. In the latter case, on-screen display
    (postscript=FALSE) only works correctly for data plots. Dose-response models
    will all be put into the last graph in this case.
    }
  \item{postscript}{
    If TRUE, (a) postscript graph(s) will be created. Otherwise, graphics will be
    displayed with a screen graphics device.
    }
  \item{color}{
    If TRUE, a sensible selection of colors will be attempted. If false, everything
    will be drawn in black
    }
  \item{datacolors}{
    This is a vector of colors, defaulting to 1:8, used for plotting the data.
    }
  \item{fitcolors}{
    Here you can specify a palette for the colors of the dose-response fits. The 
    default value is "default", which produces the default palette, if the 
    number of fits to be plotted is 8 or less. Otherwise, rainbow colors 
    will be plotted. Unless there is more than one fit per substance to be plotted,
    or the number of fits is larger than 8, the fitcolors will match the
    datacolors.
    }
}
\value{
  \item{results}{
    You will get plots of data and/or the fitted dose-response curves, on the
    screen and/or as postscript files, depending on the parameters.
    }
    
} 
\note{
  Turn off the colors if you don't like them and don't want to fiddle with
  them. Treatment of legends is quite bad. Be sure all devices are closed
  (e.g. by calling \code{dev.off()}) before calling \code{drplot} again.
}
\examples{
data(antifoul)
r <- drfit(antifoul)
\dontrun{drplot(r,antifoul)}
}
\author{
  Johannes Ranke 
  \email{jranke@uni-bremen.de} 
  \url{http://www.uft.uni-bremen.de/chemie/ranke}
}
\keyword{models}
\keyword{regression}
\keyword{nonlinear}