Tena koe Anjan ?rowMeans ?apply
You'll need to subset your data matrix to exclude the first column (e.g., yourData[,-1]). HTH .... Peter Alspach > -----Original Message----- > From: r-help-boun...@r-project.org > [mailto:r-help-boun...@r-project.org] On Behalf Of ANJAN PURKAYASTHA > Sent: Thursday, 19 November 2009 11:28 a.m. > To: r-help@r-project.org > Subject: [R] row-wise means > > I have a dataframe with 3 columns. The first column stores an > index. I would like to calculate the mean of the numbers > stored in each of the rest of the columns. > So, > here is my data matrix: > col1 col2 col3 > 1 23 34 > 2 45 56 > 3 23 56 > 4 34 68 > > For each row I would like to calculate the means of the > numbers stored in > col2 and col3. > How can this be done in R? > TIA, > Anjan > > -- > ============================= > anjan purkayastha, phd > bioinformatics analyst > whitehead institute for biomedical research nine cambridge > center cambridge, ma 02142 > > purkayas [at] wi [dot] mit [dot] edu > 703.740.6939 > > [[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.
