| % File src/library/datasets/man/iris.Rd |
| % Part of the R package, https://www.R-project.org |
| % Copyright 1995-2007 R Core Team |
| % Distributed under GPL 2 or later |
| |
| \name{iris} |
| \docType{data} |
| \alias{iris} |
| \alias{iris3} |
| \title{Edgar Anderson's Iris Data} |
| \description{ |
| This famous (Fisher's or Anderson's) iris data set gives the |
| measurements in centimeters of the variables sepal length and width |
| and petal length and width, respectively, for 50 flowers from each |
| of 3 species of iris. The species are \emph{Iris setosa}, |
| \emph{versicolor}, and \emph{virginica}. |
| } |
| \usage{ |
| iris |
| iris3 |
| } |
| \format{ |
| \code{iris} is a data frame with 150 cases (rows) and 5 variables |
| (columns) named \code{Sepal.Length}, \code{Sepal.Width}, |
| \code{Petal.Length}, \code{Petal.Width}, and \code{Species}. |
| |
| \code{iris3} gives the same data arranged as a 3-dimensional array |
| of size 50 by 4 by 3, as represented by S-PLUS. The first dimension |
| gives the case number within the species subsample, the second the |
| measurements with names \code{Sepal L.}, \code{Sepal W.}, |
| \code{Petal L.}, and \code{Petal W.}, and the third the species. |
| } |
| \source{ |
| Fisher, R. A. (1936) |
| The use of multiple measurements in taxonomic problems. |
| \emph{Annals of Eugenics}, |
| \bold{7}, Part II, 179--188. |
| |
| The data were collected by |
| Anderson, Edgar (1935). |
| The irises of the Gaspe Peninsula, |
| \emph{Bulletin of the American Iris Society}, |
| \bold{59}, 2--5. |
| } |
| \references{ |
| Becker, R. A., Chambers, J. M. and Wilks, A. R. (1988) |
| \emph{The New S Language}. |
| Wadsworth & Brooks/Cole. (has \code{iris3} as \code{iris}.) |
| } |
| \seealso{ |
| \code{\link{matplot}} some examples of which use |
| \code{iris}. |
| } |
| \examples{ |
| dni3 <- dimnames(iris3) |
| ii <- data.frame(matrix(aperm(iris3, c(1,3,2)), ncol = 4, |
| dimnames = list(NULL, sub(" L.",".Length", |
| sub(" W.",".Width", dni3[[2]])))), |
| Species = gl(3, 50, labels = sub("S", "s", sub("V", "v", dni3[[3]])))) |
| all.equal(ii, iris) # TRUE |
| } |
| \keyword{datasets} |