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  \emph{Programming with Data. A Guide to the S Language}.
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  \emph{Programming with Data. A Guide to the S Language}.
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  Springer.
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  Springer.
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}
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}
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\seealso{
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\seealso{
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  \code{\link{substitute}} for argument expression;
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  \code{\link{substitute}} for argument expression;
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  \code{\link{NA}} for ``missing values'' in data.
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  \code{\link{NA}} for \dQuote{missing values} in data.
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}
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}
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\examples{
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\examples{
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myplot <- function(x,y) {
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myplot <- function(x,y) {
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                if(missing(y)) {
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                if(missing(y)) {
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                        y <- x
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                        y <- x