tlumley@u.washington.edu
2002-Oct-09 21:21 UTC
problems with missing values created by conversion using as.matri (PR#2133)
On Wed, 9 Oct 2002 gregory_r_warnes@groton.pfizer.com wrote:> ------------------------------ > > Create a very simple data frame containing an factor and a character vector > each containing a missing value: > > > x <- data.frame( a=c("",NA), b=c(1,NA) ) > > Conversion to a matrix treats the two missing values differently: >Yes, as.matrix.data.frame() uses format() to make character strings, and it needs to check for NA as well -thomas -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- r-devel 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-devel-request@stat.math.ethz.ch _._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._