Subsetting data.tables
subset.data.table.Rd
Returns subsets of a data.table
.
Arguments
- x
data.table
to subset.- subset
logical expression indicating elements or rows to keep
- select
expression indicating columns to select from
data.table
- ...
further arguments to be passed to or from other methods
Details
The subset
argument works on the rows and will be evaluated
in the data.table
so columns can be referred to (by name) as variables
in the expression.
The data.table
that is returned will maintain the original keys
as long as they are not select
-ed out.