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\name{iris}
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\name{iris}
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\docType{data}
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\docType{data}
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\alias{iris}
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\alias{iris}
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\alias{iris3}
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\alias{iris3}
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\title{Edgar Anderson's Iris Data}
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\title{Edgar Anderson's Iris Data}
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\description{
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\description{
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  This famous (Fisher's or Anderson's) iris data set gives the
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  This famous (Fisher's or Anderson's) iris data set gives the
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  measurements in centimeters of the variables sepal length and width
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  measurements in centimeters of the variables sepal length and width
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  and petal length and width, respectively, for 50 flowers from each
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  and petal length and width, respectively, for 50 flowers from each
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  of 3 species of iris.  The species are \emph{Iris setosa},
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  of 3 species of iris.  The species are \emph{Iris setosa},
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  \emph{versicolor}, and \emph{virginica}.
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  \emph{versicolor}, and \emph{virginica}.
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}
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}
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\usage{
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\usage{
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data(iris)
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data(iris)
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data(iris3)
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data(iris3)
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}
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}
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\format{
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\format{
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  \code{iris} is a data frame with 150 cases (rows) and 5 variables
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  \code{iris} is a data frame with 150 cases (rows) and 5 variables
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  (columns) named \code{Sepal.Length}, \code{Sepal.Width},
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  (columns) named \code{Sepal.Length}, \code{Sepal.Width},
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  \code{Petal.Length}, \code{Petal.Width}, and \code{Species}.
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  \code{Petal.Length}, \code{Petal.Width}, and \code{Species}.
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  \code{iris3} gives the same data arranged as a 3-dimensional array
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  \code{iris3} gives the same data arranged as a 3-dimensional array
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  of size 50 by 4 by 3, as represented by S-PLUS.  The first dimension
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  of size 50 by 4 by 3, as represented by S-PLUS.  The first dimension
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  gives the case number within the species subsample, the second the
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  gives the case number within the species subsample, the second the
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  measurements with names \code{Sepal L.}, \code{Sepal W.},
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  measurements with names \code{Sepal L.}, \code{Sepal W.},
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  \code{Petal L.}, and \code{Petal W.}, and the third the species.
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  \code{Petal L.}, and \code{Petal W.}, and the third the species.
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}
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}
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\source{
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\source{
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  Fisher, R. A. (1936)
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  Fisher, R. A. (1936)
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  The use of multiple measurements in taxonomic problems.
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  The use of multiple measurements in taxonomic problems.
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  \emph{Annals of Eugenics},
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  \emph{Annals of Eugenics},
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  \bold{7}, Part II, 179--188.
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  \bold{7}, Part II, 179--188.
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  The data were collected by
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  The data were collected by
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  Anderson, Edgar (1935).
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  Anderson, Edgar (1935).
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  The irises of the Gaspe Peninsula,
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  The irises of the Gaspe Peninsula,
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  \emph{Bulletin of the American Iris Society},
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  \emph{Bulletin of the American Iris Society},
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  \bold{59}, 2--5.
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  \bold{59}, 2--5.
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}
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}
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\references{
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\references{
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  Becker, R. A., Chambers, J. M. and Wilks, A. R. (1988)
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  Becker, R. A., Chambers, J. M. and Wilks, A. R. (1988)
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  \emph{The New S Language}.
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  \emph{The New S Language}.
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  Wadsworth \& Brooks/Cole. (has \code{iris3} as \code{iris}.)
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  Wadsworth \& Brooks/Cole. (has \code{iris3} as \code{iris}.)
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}
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}
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\seealso{
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\seealso{\code{\link{matplot}} some examples of which use \code{iris}.}
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  \code{\link[graphics]{matplot}} some examples of which use
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  \code{iris}.
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}
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\examples{
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\examples{
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data(iris3)
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data(iris3)
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dni3 <- dimnames(iris3)
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dni3 <- dimnames(iris3)
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ii <- data.frame(matrix(aperm(iris3, c(1,3,2)), ncol=4,
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ii <- data.frame(matrix(aperm(iris3, c(1,3,2)), ncol=4,
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                   dimnames=list(NULL, sub(" L.",".Length",
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                   dimnames=list(NULL, sub(" L.",".Length",
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                                           sub(" W.",".Width", dni3[[2]])))),
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                                           sub(" W.",".Width", dni3[[2]])))),
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                 Species = gl(3,50,lab=sub("S","s",sub("V","v",dni3[[3]]))))
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                 Species = gl(3,50,lab=sub("S","s",sub("V","v",dni3[[3]]))))
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data(iris)
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data(iris)
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all.equal(ii, iris) # TRUE
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all.equal(ii, iris) # TRUE
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}
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}
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\keyword{datasets}
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\keyword{datasets}