converting among modes
On Fri, 27 Jul 2001, Martin Henry H. Stevens wrote:
Windows 2000, R 1.3.0 I have been given a data set (ASCII tab delimited) in which many variables that are supposed to be numeric actually contain characters. I would be happy to have those character entries disappear and become NA. When I use read.table and then attempt to convert these using as.numeric(), of course it doesn't work, and I get the ASCII? representation? maybe? When
Yes, `of course'. You need as.numeric(as.character()) since those columns are factors. (See the FAQ item 7.13.)
Brian D. Ripley, ripley at stats.ox.ac.uk Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ University of Oxford, Tel: +44 1865 272861 (self) 1 South Parks Road, +44 1865 272860 (secr) Oxford OX1 3TG, UK Fax: +44 1865 272595 -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html Send "info", "help", or "[un]subscribe" (in the "body", not the subject !) To: r-help-request at stat.math.ethz.ch _._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._