On 13-04-30 3:38 AM, Suharto Anggono Suharto Anggono wrote:
This is just info.
I recently got something like this.
x <- factor(c("A","A","B","B"), levels=c("A","B"))
y <- factor(c("a","b","a","b"), levels=c("a","b"))
table(x, y)[, "a"] / table(x)
x
A B
0.5 0.5
attr(,"class")
[1] "table"
The printing indicates that the result is of class 'table'. But, the 'print' method of
class 'table' does not print attr(,"class"). It seems that 'print.default' is
used in the printing. I am OK with it, just unusual.
This is fixed as of r62697 in R-devel and R-patched.
The documentation in ?Arithmetic was also inaccurate, and has been
modified. The correct description is now:
The rules for determining the attributes of the result are rather
complicated. Most attributes are taken from the longer argument.
Names will be copied from the first if it is the same length as the
answer, otherwise from the second if that is. If the arguments are
the same length, attributes will be copied from both, with those of
the first argument taking precedence when the same attribute is
present in both arguments. For time series, these operations are
allowed only if the series are compatible, when the class and
\code{\link{tsp}} attribute of whichever is a time series (the same,
if both are) are used. For arrays (and an array result) the
dimensions and dimnames are taken from first argument if it is an
array, otherwise the second.
This was true for R 3.0.0 and earlier as well, but before my patch while
the class was copied from the second argument, the object bit was copied
from the first argument. Now things are consistent.
Duncan Murdoch
I think, that is another symptom of an already known behavior as in the
following:
- PR#2345: difftime arithmetic
- PR#13209: S4 object does not commute?
sessionInfo()
R version 3.0.0 (2013-04-03)
Platform: i386-w64-mingw32/i386 (32-bit)
locale:
[1] LC_COLLATE=English_United States.1252
[2] LC_CTYPE=English_United States.1252
[3] LC_MONETARY=English_United States.1252
[4] LC_NUMERIC=C
[5] LC_TIME=English_United States.1252
attached base packages:
[1] stats graphics grDevices utils datasets methods base
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