(PR#9917) rbind.data.frame converts character column to
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Please do read the documentation, which says
The 'rbind' data frame method first drops all zero-column and
zero-row arguments.
So your first data frame has been dropped, and the result is the same as
rbind.data.frame(list(a = "foo")) which should give a factor column via
promotion of a list to a data frame.
On Tue, 18 Sep 2007, sebastien.villemot at ens.fr wrote:
Full_Name: S?bastien Villemot Version: 2.5.1 OS: Debian GNU/Linux (Testing aka "Lenny") Submission from: (NULL) (193.51.127.120) Here is the transcript of a R session under version 2.5.1:
x <- data.frame(a = I(character(0))) typeof(x$a)
[1] "character"
x <- rbind(x, list(a = "foo")) typeof(x$a)
[1] "integer" The column "a" has been converted from character to factor. This was not happening under version 2.4.0 Patched (2006-11-25 r39997):
x <- data.frame(a = I(character(0))) typeof(x$a)
[1] "character"
x <- rbind(x, list(a = "foo")) typeof(x$a)
[1] "character" Furthermore, the bug doesn't show up (in 2.5.1) if the data frame is initially non-empty:
x <- data.frame(a = I("bar"))
typeof(x$a)
[1] "character"
x <- rbind(x, list(a = "foo")) typeof(x$a)
[1] "character" Best, S?bastien Villemot
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