Returns the output data requested by the user
            @ In, indices, a list of non-negative integers specifying
            the row indices to return
            @ Out, an nparray of floating point values specifying the output
            data values filtered by the indices input parameter.

def get_y(self, indices=None):
        """ Returns the output data requested by the user
            @ In, indices, a list of non-negative integers specifying
            the row indices to return
            @ Out, an nparray of floating point values specifying the output
            data values filtered by the indices input parameter.
        """
        if indices is None:
            indices = list(range(0, self.get_sample_size()))
        else:
            if not hasattr(indices, "__iter__"):
                indices = [indices]
            indices = sorted(list(set(indices)))

        if len(indices) == 0:
            return []
        return self.Y[indices]