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\name{pull.map}
\alias{pull.map}
\title{Pull out the genetic map from a cross}
\description{
Pull out the map portion of a cross object.
}
\usage{pull.map(cross, chr)}
\arguments{
\item{cross}{An object of class \code{cross}. See
\code{\link[qtl]{read.cross}} for details.}
\item{chr}{An optional vector specifying which chromosomes to keep or
discard. This may be a logical vector, a numeric vector, or a vector
of character strings.}
}
\value{
The genetic map: a list with each component containing the marker
positions (in cM) for a chromosome. Each component has class
\code{A} or \code{X} according to whether it is an autosome or the X
chromosome. The components are either vectors of marker positions or,
for a sex-specific map, 2-row matrices containing the female and male
marker locations. The map itself is given class \code{map}.
}
\author{Karl W Broman, \email{kbroman@biostat.wisc.edu} }
\examples{
data(fake.f2)
map <- pull.map(fake.f2)
plot(map)
}
\seealso{ \code{\link[qtl]{replace.map}}, \code{\link[qtl]{plot.map}} }
\keyword{utilities}
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