Dear R developers Would you consider adding a 'data.frame' method for the base::rep function? The need to replicate a df row-wise can easily arise while programming, and rep() is unable to handle such a case. See below. > x <- iris[1, ] > x Sepal.Length Sepal.Width Petal.Length Petal.Width Species 1 5.1 3.5 1.4 0.2 setosa > rep(x, 2) $Sepal.Length [1] 5.1
$Sepal.Width [1] 3.5 $Petal.Length [1] 1.4 $Petal.Width [1] 0.2 $Species [1] setosa Levels: setosa versicolor virginica $Sepal.Length [1] 5.1 $Sepal.Width [1] 3.5 $Petal.Length [1] 1.4 $Petal.Width [1] 0.2 $Species [1] setosa Levels: setosa versicolor virginica I found a 'rep.data.frame' function in package 'mefa' [2], but I think it would be nice to have it in base R. In any case, the code used by the method is very simple. > require(mefa) Loading required package: mefa mefa 3.2-1 2011-05-13 > mefa:::rep.data.frame function (x, ...) as.data.frame(lapply(x, rep, ...)) <environment: namespace:mefa> And here's the example above: > rep(x, 2) Sepal.Length Sepal.Width Petal.Length Petal.Width Species 1 5.1 3.5 1.4 0.2 setosa 2 5.1 3.5 1.4 0.2 setosa Please le t me know what you think. Regards Liviu [1] http://finzi.psych.upenn.edu/R/library/mefa/html/rep.data.frame.html [2] http://cran.at.r-project.org/web/packages/mefa/index.html -- Do you know how to read? http://www.alienetworks.com/srtest.cfm http://goodies.xfce.org/projects/applications/xfce4-dict#speed-reader Do you know how to write? http://garbl.home.comcast.net/~garbl/stylemanual/e.htm#e-mail ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
