Group values according to an indicator function and return group counts.
Group element entries as arrays associated with distinct keys.
Generate a frequency table according to an indicator function.
Group values as arrays associated with distinct keys.
Group values according to an indicator function.
Group element values according to an indicator function.
Generate a frequency table.
Split element indices into two groups according to an predicate function.
Split element entries into two groups according to an predicate function.
Group element entries according to an indicator function.
Split element values into two groups according to an predicate function.
Group elements as arrays associated with distinct keys.
Group element indices according to an indicator function.
