id {plyr} | R Documentation |
Compute a unique numeric id for each unique row in a data frame.
Description
Properties:
-
order(id)
is equivalent todo.call(order, df)
rows containing the same data have the same value
if
drop = FALSE
then room for all possibilites
Usage
id(.variables, drop = FALSE)
Arguments
.variables |
list of variables |
drop |
drop unusued factor levels? |
Value
a numeric vector with attribute n, giving total number of possibilities
See Also
[Package plyr version 1.8.9 Index]