A way to do it : TEST$Y3[TEST$Y3=="Z"] <- NA
TEST$Y3 <- as.numeric(TEST$Y3) 2005/12/8, zhihua li <[EMAIL PROTECTED]>: > > hi netters, > > i have a dataframe TEST like this: > > Y1 Y2 Y3 > X1 4 7 8 > X2 6 2 Z > X3 8 0 1 > > i would like to change it to a numeric matrix, replacing "Z" with NA > > Y1 Y2 Y3 > X1 4 7 8 > X2 6 2 NA > X3 8 0 1 > > i've tried the function data.matrix but it didn't work. is there any easy > way to do this? > > thanks a lot! > > > > ______________________________________________ > R-help@stat.math.ethz.ch mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide! > http://www.R-project.org/posting-guide.html > > -- David [[alternative HTML version deleted]] ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
