On Fri, 21 Oct 2011, David Winsemius wrote:
The last part ("in the same column") does not make sense, since I was interpreting the term "parameter" to mean a value in a particular column.
David, That's what I meant: two values from the 'param' column.
Assuming these are R NA's then logical indexing: with( chemdata, chemdata[!is.na(param1) & !is.na(param2) , ])
I'll read the with() help page again. And, I'll try the above with "TDS" replacing param1 and "Cond" replacing param2. Thanks, Rich ______________________________________________ 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.
