When calling read.table() and supplying colClasses and header=FALSE,
it is possible for the resulting data frame to have NA in the names.
(The warning "not all columns named in 'colClasses' exist" is
returned)
Here is such a data frame:
x <- structure(list(a = 1:10,
"NA" = c(NA, NA, NA, NA, NA, NA, NA, NA, NA, NA)),
.Names = c("a", NA_character_),
row.names = c(NA, -10L),
class = "data.frame")
One undesirable property of such a data frame is that subset() has
trouble with it:
subset(x, a > 5)
Error in `[.data.frame`(x, r, vars, drop = drop) :
undefined columns selected
Is this a bug in read.table() ?
Thanks
Ben
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