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\description{
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\description{
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  Makes the elements of a character vector unique by
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  Makes the elements of a character vector unique by
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  appending sequence numbers to duplicates.
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  appending sequence numbers to duplicates.
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}
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}
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\usage{
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\usage{
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make.unique(names, sep=".")
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make.unique(names, sep = ".")
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}
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}
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\arguments{
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\arguments{
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  \item{names}{a character vector}
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  \item{names}{a character vector}
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  \item{sep}{a character string used to separate a duplicate name from
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  \item{sep}{a character string used to separate a duplicate name from
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    its sequence number.}
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    its sequence number.}
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}
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}
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\value{
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\value{
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  a character vector of same length as \code{names} with duplicates changed.
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  A character vector of same length as \code{names} with duplicates changed.
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}
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}
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\details{
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\details{
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  The algorithm used by \code{make.unique} has the property that
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  The algorithm used by \code{make.unique} has the property that
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  \code{make.unique(c(A, B)) == make.unique(c(make.unique(A), B))}.
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  \code{make.unique(c(A, B)) == make.unique(c(make.unique(A), B))}.
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