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}
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}
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\details{
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\details{
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  This is intended for data frames with \emph{numeric} columns. For more
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  This is intended for data frames with \emph{numeric} columns. For more
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  than two columns it first calls \code{\link{data.matrix}} to convert
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  than two columns it first calls \code{\link{data.matrix}} to convert
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  the data frame to a numeric matrix and then calls \code{\link{pairs}}
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  the data frame to a numeric matrix and then calls \code{\link{pairs}}
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  to produce a scatterplot matrix).  This can fail and may well be
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  to produce a scatterplot matrix.  This can fail and may well be
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  inappropriate: for example numerical conversion of dates will lose
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  inappropriate: for example numerical conversion of dates will lose
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  their special meaning and a warning will be given.
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  their special meaning and a warning will be given.
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  For a two-column data frame it plots the second column against the
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  For a two-column data frame it plots the second column against the
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  first by the most appropriate method for the first column.
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  first by the most appropriate method for the first column.