When split's x argument has a class attribute and the
grouping vector, f, is shorter than x then split gives
the wrong result. It appears to not extend f to the length
of x before doing the split. E.g.,
> split(factor(letters[1:3]), "Group one") # expect all 3 elements in
the single group
$`Group one`
[1] a
Levels: a b c
> split(factor(letters[1:3]), c("Group one", "Group two")) # expect
warning and Group one should contain "a" and "c".
$`Group one`
[1] a
Levels: a b c
$`Group two`
[1] b
Levels: a b c
We expect the above to act like the similar cases where x is
a character vector
> split(letters[1:3], "Group one")
$`Group one`
[1] "a" "b" "c"
> split(letters[1:3], c("Group one", "Group two"))
$`Group one`
[1] "a" "c"
$`Group two`
[1] "b"
Warning message:
In split.default(letters[1:3], c("Group one", "Group two")) :
data length is not a multiple of split variable
We get a similar problem for other stray classes of x
> split(structure(letters[1:3],class="no sUch cLaSs"), c("Group one",
"Group two"))
$`Group one`
[1] "a"
$`Group two`
[1] "b"
Bill Dunlap
Spotfire, TIBCO Software
wdunlap tibco.com
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