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\name{margin.table}
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\alias{margin.table}
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\title{Compute table margin}
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\description{
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  For a contingency table in array form, compute the sum of table
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  entries for a given index.
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}
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\usage{
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margin.table(x, margin=NULL)
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}
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\arguments{
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  \item{x}{an array}
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  \item{margin}{index number (1 for rows, etc.) }
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}
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\details{
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  This is really just \code{apply(x, margin, sum)} packaged up for
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  newbies, except that if \code{margin} has length zero you get
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  \code{sum(x)}.
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}
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\value{
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  The relevant marginal table.  The class of \code{x} is copied to the
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  output table, except in the summation case.
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}
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\author{Peter Dalgaard}
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\examples{
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m<-matrix(1:4,2)
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margin.table(m,1)
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margin.table(m,2)
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}
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\keyword{array}