How to get the rowindices without using which?
try this: dat <- iris[sample(1:nrow(iris), 10), ] dat match(rownames(dat), rownames(iris)) I hope it helps. Best, Dimitris ---- Dimitris Rizopoulos Ph.D. Student Biostatistical Centre School of Public Health Catholic University of Leuven Address: Kapucijnenvoer 35, Leuven, Belgium Tel: +32/(0)16/336899 Fax: +32/(0)16/337015 Web: http://www.med.kuleuven.be/biostat/ http://www.student.kuleuven.be/~m0390867/dimitris.htm ----- Original Message ----- From: "Martin Lam" <tmlammail at yahoo.com> To: "R" <r-help at stat.math.ethz.ch> Sent: Monday, September 26, 2005 10:37 AM Subject: [R] How to get the rowindices without using which?
Hi, I was wondering if it is possible to get the rowindices without using the function "which" because I don't have a restriction criteria. Here's an example of what I mean: # take 10 randomly selected instances iris[sample(1:nrow(iris), 10),] # output Sepal.Length Sepal.Width Petal.Length Petal.Width Species 76 6.6 3.0 4.4 1.4 versicolor 105 6.5 3.0 5.8 2.2 virginica 131 7.4 2.8 6.1 1.9 virginica 79 6.0 2.9 4.5 1.5 versicolor 69 6.2 2.2 4.5 1.5 versicolor 42 4.5 2.3 1.3 0.3 setosa 25 4.8 3.4 1.9 0.2 setosa 129 6.4 2.8 5.6 2.1 virginica 60 5.2 2.7 3.9 1.4 versicolor 80 5.7 2.6 3.5 1.0 versicolor What I want to get are their rownumbers: 76, 105, 131, 79, 69, 42, 25, 129, 60, 80. Thanks in advance, Martin
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