?row row(iris)[iris[,1]==6.2] ##or better yet
?which which(iris[,1]==6.2) Note also that both may fail because the test may not be numerically exact -- you may need to add fuzz. -- Bert Gunter Genentech Non-Clinical Statistics South San Francisco, CA "The business of the statistician is to catalyze the scientific learning process." - George E. P. Box > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Martin Lam > Sent: Friday, September 16, 2005 10:35 AM > To: R > Subject: [R] How do I get the row indices? > > Hi, > > I was wondering if it's possible to get the row > numbers from a filtering. Here's an example: > > # give me the rows with sepal.length == 6.2 > iris[(iris[,1]==6.2),] > > # output > Sepal.Length Sepal.Width Petal.Length Petal.Width > Species > 69 6.2 2.2 4.5 1.5 > versicolor > 98 6.2 2.9 4.3 1.3 > versicolor > 127 6.2 2.8 4.8 1.8 > virginica > 149 6.2 3.4 5.4 2.3 > virginica > > What I really want is that it return the row numbers: > 69, 98, 127, 149. > > Thanks in advance, > > Martin > > ______________________________________________ > R-help@stat.math.ethz.ch mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide! > http://www.R-project.org/posting-guide.html > ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html