packages/vaex-core/vaex/dataframe.py
def add_virtual_columns_cartesian_to_spherical(self, x="x", y="y", z="z", alpha="l", delta="b", distance="distance", radians=False, center=None, center_name="solar_position"):
        """Convert cartesian to spherical coordinates.



        :param x:
        :param y:
        :param z:
        :param alpha:
        :param delta: name for polar angle, ranges from -90 to 90 (or -pi to pi when radians is True).
        :param distance:
        :param radians:
        :param center:
        :param center_name:
        :return:
        """
        transform = "" if radians else "*180./pi"

        if center is not None:
            self.add_variable(center_name, center)
        if center is not None and center[0] != 0:
            x = "({x} - {center_name}[0])".format(**locals())
        if center is not None and center[1] != 0:
            y = "({y} - {center_name}[1])".format(**locals())
        if center is not None and center[2] != 0:
            z = "({z} - {center_name}[2])".format(**locals())
        self.add_virtual_column(distance, "sqrt({x}**2 + {y}**2 + {z}**2)".format(**locals()))
        # self.add_virtual_column(alpha, "((arctan2({y}, {x}) + 2*pi) % (2*pi)){transform}".format(**locals()))
        self.add_virtual_column(alpha, "arctan2({y}, {x}){transform}".format(**locals()))
        self.add_virtual_column(delta, "(-arccos({z}/{distance})+pi/2){transform}".format(**locals()))
def add_virtual_columns_cartesian_to_spherical(self, x="x", y="y", z="z", alpha="l", delta="b", distance="distance", radians=False, center=None, center_name="solar_position"):
        """Convert cartesian to spherical coordinates.



        :param x:
        :param y:
        :param z:
        :param alpha:
        :param delta: name for polar angle, ranges from -90 to 90 (or -pi to pi when radians is True).
        :param distance:
        :param radians:
        :param center:
        :param center_name:
        :return:
        """
        transform = "" if radians else "*180./pi"

        if center is not None:
            self.add_variable(center_name, center)
        if center is not None and center[0] != 0:
            x = "({x} - {center_name}[0])".format(**locals())
        if center is not None and center[1] != 0:
            y = "({y} - {center_name}[1])".format(**locals())
        if center is not None and center[2] != 0:
            z = "({z} - {center_name}[2])".format(**locals())
        self.add_virtual_column(distance, "sqrt({x}**2 + {y}**2 + {z}**2)".format(**locals()))
        # self.add_virtual_column(alpha, "((arctan2({y}, {x}) + 2*pi) % (2*pi)){transform}".format(**locals()))
        self.add_virtual_column(alpha, "arctan2({y}, {x}){transform}".format(**locals()))
        self.add_virtual_column(delta, "(-arccos({z}/{distance})+pi/2){transform}".format(**locals()))
Convert cartesian to spherical coordinates.



        :param x:
        :param y:
        :param z:
        :param alpha:
        :param delta: name for polar angle, ranges from -90 to 90 (or -pi to pi when radians is True).
        :param distance:
        :param radians:
        :param center:
        :param center_name:
        :return: