subsetp: Subset function that preserves column attributes.
Description
Subset function that preserves column attributes.
Usage
subsetp(x, ..., droplevels = TRUE)
Arguments
...
Further arguments passed to subset.
droplevels
If TRUE (the default), then unused factor levels are dropped (see droplevels).
Value
An object similar to x containing just the selected elements.
In the case of a data.frame, attributes of columns (such as
label and units) are preserved.