\name{chrIndices}
\alias{chrIndices}
\title{Get a matrix of first and last index of features in each chromosome}
\arguments{
  \item{object}{GenoSet, RangedData, or GRanges}

  \item{chr}{character, specific chromosome name}
}
\value{
  data.frame with "first" and "last" columns
}
\description{
  Sometimes it is handy to know the first and last index
  for each chr. This is like chrInfo but for feature
  indices rather than chromosome locations. If chr is
  specified, the function will return a sequence of
  integers representing the row indices of features on that
  chromosome.
}
\examples{
data(genoset)
  chrIndices(genoset.ds)
  chrIndices(locData(genoset.ds))  # The same
}
\author{
  Peter M. Haverty
}