Makes sense if you realize that ?"[" only applies to *vector*,
*list*, and *matrix* indexing and that data frames follow their own
rules that are documented elsewhere ...
So yes, not a bug but I claim it's an infelicity. I might submit a
doc patch.
FWIW
b["A1",]
as.matrix(b)["A1",]
i
I don't think this is a bug in the documentation. The help page for
`?[.data.frame` has the following in the last paragraph of the
details:
Both [ and [[ extraction methods partially match row names. By default
neither partially match column names, but [[ will if exact = FALSE
(and with a warning
People are often surprised that row-indexing a data frame by [ +
character does partial matching (and annoyed that there is no way to
turn it off:
https://stackoverflow.com/questions/18033501/warning-when-partial-matching-rownames
https://stackoverflow.com/questions/34233235/r-returning-p
