igroup()FunctionGroup a list of arrays by the value of some index. This function is the same
as @{function:mgroup}, except it operates on the values of array indexes
rather than the return values of method calls.igroup()FunctionGroup a list of arrays by the value of some index. This function is the same
as @{function:mgroup}, except it operates on the values of array indexes
rather than the return values of method calls.