and then, if you want a matrix and not a data.frame : TEST <- as.matrix(TEST)
2005/12/8, David Hajage <[EMAIL PROTECTED]>: > > 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<http://www.r-project.org/posting-guide.html> > > > > > > > -- > David -- 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
