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}
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}
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\details{
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\details{
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  \code{merge} is a generic function whose principal method is for data
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  \code{merge} is a generic function whose principal method is for data
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  frames: the default method coerces its arguments to data frames and
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  frames: the default method coerces its arguments to data frames and
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  calls the \code{"data.frame"} method.
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  calls the \code{"data.frame"} method.
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  By default the data frames are merged on the columns with names they
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  By default the data frames are merged on the columns with names they
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  both have, but separate specifications of the columns can be given by
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  both have, but separate specifications of the columns can be given by
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  \code{by.x} and \code{by.y}.  The rows in the two data frames that
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  \code{by.x} and \code{by.y}.  The rows in the two data frames that
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  match on the specified columns are extracted, and joined together.  If
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  match on the specified columns are extracted, and joined together.  If
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  there is more than one match, all possible matches contribute one row
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  there is more than one match, all possible matches contribute one row