units.py 文件源码

def __init__(self, x, y, post_eng_to_phys=unit_function, pre_phys_to_eng=unit_function):
        """ PChip interpolation for converting between physics and engineering units.

        Args:
            x(list): A list of points on the x axis. These must be in increasing order
                for the interpolation to work. Otherwise, a ValueError is raised.
            y(list): A list of points on the y axis. These must be in increasing or
                decreasing order. Otherwise, a ValueError is raised.

        Raises:
            ValueError: An error occured when the given y coefficients are neither in
            increasing or decreasing order.
        """
        super(self.__class__, self).__init__(post_eng_to_phys, pre_phys_to_eng)
        self.x = x
        self.y = y
        self.pp = PchipInterpolator(x, y)

        diff = numpy.diff(y)
        if not ((numpy.all(diff > 0)) or (numpy.all((diff < 0)))):
            raise ValueError("Given coefficients must be monotonically"
                             "decreasing.")