Hi,
I still have little ability to predict how these functions will treat the
columns of data frames:
> # Here's a data frame with a column "a" of integers,
> # and a column "b" of characters:
> df <- data.frame(
+ a = 1:2,
+ b = c("a","b")
+ )
> df
a b
1 1 a
2 2 b
>
> # Except -- both columns are characters:
> apply (df, 2, typeof)
a b
"character" "character"
>
> # Except -- they're both integers:
> lapply (df, typeof)
$a
[1] "integer"
$b
[1] "integer"
>
> # Except -- only one of those integers is numeric:
> lapply (df, is.numeric)
$a
[1] TRUE
$b
[1] FALSE
Many thanks,
Jeff
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