Hello list, I was trying to select a column of a data frame using the *which* command. I was actually selecting the rows of the data frame using *which, *and then displayed a certain column of it. The command that I was using is: sequence=*mydata*[*which*(human[,3] %in% genes.sam.names),*9*] In the above command, *mydata *is my data frame, *9 *is the column which I want to display. The rest are just other variables that I use. The *which*command is supposed to retrieve the rows of interst. The rows are well retrieved, however, if for the certain row, column *9* is NA, the respective element of column *10* is displayed. How can I fix that?
Thank you very much, Eleni [[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.