Mark, Ted, Gabor, Thanks for all your input. José
-----Original Message----- From: Gabor Grothendieck [mailto:ggrothendi...@gmail.com] Sent: 01 April 2009 18:12 To: Jose Iparraguirre D'Elia Cc: r-help@r-project.org Subject: Re: [R] A query about na.omit First input the data frame: > Lines <- "x y z + 1 1 1 + 2 2 2 + 3 3 NA + 4 NA 4 + NA 5 5" > > DF <- read.table(textConnection(Lines), header = TRUE) > # Now uses complete.cases to get required rows: > > DF[complete.cases(DF[1:2]),] x y z 1 1 1 1 2 2 2 2 3 3 3 NA On Wed, Apr 1, 2009 at 11:49 AM, Jose Iparraguirre D'Elia <j...@erini.ac.uk> wrote: > Dear all, > > Say I have the following dataset: > >> DF > x y z > [1] 1 1 1 > [2] 2 2 2 > [3] 3 3 NA > [4] 4 NA 4 > [5] NA 5 5 > > And I want to omit all the rows which have NA, but only in columns X and Y, > so that I get: > > x y z > 1 1 1 > 2 2 2 > 3 3 NA > > If I use na.omit(DF), I would delete the row for which z=NA, obtaining thus > > x y z > 1 1 1 > 2 2 2 > > But this is not what I want, of course. > If I use na.omit(DF[,1:2]), then I obtain > > x y > 1 1 > 2 2 > 3 3 > > which is OK for x and y columns, but I wouldn't get the corresponding values > for z (ie 1 2 NA) > > Any suggestions about how to obtain the desired results efficiently (the > actual dataset has millions of records and almost 50 columns, and I would > apply the procedure on 12 of these columns)? > > Sincerely, > > Jose Luis > > Jose Luis Iparraguirre > Senior Research Economist > Economic Research Institute of Northern Ireland > > > > [[alternative HTML version deleted]] > > ______________________________________________ > R-help@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. > ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
