List seems to drop empty levels of factors when containin g them
I don't get the same result, do you have a package loaded that would change the default behavior (such as Hmisc)?
list(grp.1)
[[1]] [1] 1 2 Levels: 1 2
list(grp.1[mask])
[[1]] [1] 1 Levels: 1 2
library(Hmisc)
<<snip>>
list(grp.1[mask])
[[1]] [1] 1 Levels: 1 --Matt
version
_ platform i386-pc-mingw32 arch i386 os mingw32 system i386, mingw32 status major 2 minor 0.0 year 2004 month 10 day 04 language R -----Original Message----- From: r-help-bounces at stat.math.ethz.ch [mailto:r-help-bounces at stat.math.ethz.ch]On Behalf Of Andrew Robinson Sent: Tuesday, November 09, 2004 19:44 PM To: R-Help Discussion Cc: Andrew Robinson Subject: [R] List seems to drop empty levels of factors when containing them Greetings R community, I am curious about the following behaviour: if I define a factor, and then store a subset of it in a list, the stored version seems to drop levels that were not included in the subset. E.g. ..
mask <- c(T, F) grp.1 <- factor(c(1,2)) list(grp.1)
[[1]] [1] 1 2 Levels: 1 2
list(grp.1[mask])
[[1]] [1] 1 Levels: 1 It is as though the list were redefining the factor and dropping empty levels. I would like to keep them (I am using the list for a two-dimensional tapply). Is there any way to avoid this? I'm using R 2.0.0 on FreeBSD 5.2.1. Thanks, Andrew
Andrew Robinson Ph: 208 885 7115 Department of Forest Resources Fa: 208 885 6226 University of Idaho E : andrewr at uidaho.edu PO Box 441133 W : http://www.uidaho.edu/~andrewr Moscow ID 83843 Or: http://www.biometrics.uidaho.edu No statement above necessarily represents my employer's opinion. ______________________________________________ R-help at 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