\name{whichInGrob}

\alias{whichInGrob}

\title{

Return indices of layers of interest from the grob object

}

\description{

The function matches the supplied vector of grob's layer names to the grob object and returns the indices of those layer names.

}

\usage{

whichInGrob(grob, layer)

}

\arguments{

  \item{grob}{grob}

  \item{layer}{character vector}

}

\details{

If the layer doesn't exist the function returns NA.

}

\value{

numeric vector

}

\author{

Małgorzata Oleś <dr.malgorzata.oles@gmail.com>

}

\examples{

library("ggplot2")

gg = ggplotGrob(qplot(1,1))

whichInGrob(gg, "xlab-b")

whichInGrob(gg, c("xlab-b","panel"))

}