On Wed, 2005-02-02 at 13:54 +1300, Brett Stansfield wrote: > can you tell me how to ask R to analyse a subset of data > > eg. supposing the data set consists of 9 columns and I only want R to > analyse columns 1, 3 and 5 > > how would I command R to conduct eg. boxplots of those variables only?
#Create a matrix with 9 columns mat <- matrix(rnorm(90), ncol = 9) # create a boxplot from cols 1,3 and 5 boxplot(data.frame(mat[, c(1, 3, 5)])) In this case, passing the 3 columns of the matrix as a data frame enables boxplot() to plot the 3 columns in a single call. There is an example of this in ?boxplot. You might also want to review the help for extracting sections of multi- dimensional objects: ?Extract or ?"[" and the examples therein. HTH, Marc Schwartz ______________________________________________ [email protected] mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
