Method apply

qlib/utils/index_data.py:459–462

apply a function to data.

(self, func: Callable)

        return self.__class__(tmp_data, *self.indices)

    def apply(self, func: Callable):
        """apply a function to data."""
        tmp_data = func(self.data)
        return self.__class__(tmp_data, *self.indices)

    def __len__(self):
        """the length of the data.