(integer | logical | NULL)
Selected cases. Either a logical or an index vector.
By default NULL if all observations are used.
(character | integer | logical)
Vector of selected inputs. You can either pass a character vector with the
feature names, a vector of indices, or a logical vector.
In case of an index vector each element denotes the position of the feature
name returned by getTaskFeatureNames.
Note that the target feature is always included in the
resulting task, you should not pass it here.
Default is to use all features.