コード例 #1
0
def test_cgs_equivalent():
    """
    Get cgs equivalent to some unit.

    """
    from dimensionful.dimensions import mass_density
    from dimensionful.units import get_conversion_factor

    Msun_cgs = 1.98892e33
    Mpc_cgs = 3.08568e24

    u1 = Unit("Msun * Mpc**-3")
    u2 = Unit("g * cm**-3")
    u3 = u1.get_cgs_equivalent()

    assert u2.expr == u3.expr
    assert u2 == u3

    assert equal_sigfigs(u1.cgs_value, Msun_cgs / Mpc_cgs ** 3, 8)
    assert u2.cgs_value == 1
    assert u3.cgs_value == 1

    assert u1.dimensions == mass_density
    assert u2.dimensions == mass_density
    assert u3.dimensions == mass_density

    assert equal_sigfigs(get_conversion_factor(u1, u3), Msun_cgs / Mpc_cgs ** 3, 8)
コード例 #2
0
ファイル: quantity.py プロジェクト: caseywstark/dimensionful
    def convert_to(self, units):
        """
        Convert the data and units to given unit. This overwrites the ``data``
        and ``units`` attributes, making no copies, and returns None.

        Parameters
        ----------
        units : Unit object or string
            The units you want the data in.

        """
        new_units = self._unit_repr_check_same(units)
        conversion_factor = get_conversion_factor(self.units, new_units)
        self.data *= conversion_factor
        self.units = new_units

        return self
コード例 #3
0
ファイル: quantity.py プロジェクト: caseywstark/dimensionful
    def get_in(self, units):
        """
        Creates a new Quantity with the data in the supplied units, and returns
        it. Does not modify this object.

        Parameters
        ----------
        units : Unit object or string
            The units you want to get a new quantity in.

        Returns
        -------
        Quantity object with converted data and supplied units.

        """
        new_units = self._unit_repr_check_same(units)
        conversion_factor = get_conversion_factor(self.units, new_units)

        return Quantity(self.data * conversion_factor, new_units)
コード例 #4
0
ファイル: quantity.py プロジェクト: caseywstark/dimensionful
    def get_data_in(self, units):
        """
        Returns the data, converted to the supplied units.

        Parameters
        ----------
        units : Unit object or string
            The units you want the data in.

        Returns
        -------
        ``data`` attribute, multiplied by the conversion factor to the supplied
        units.

        """
        new_units = self._unit_repr_check_same(units)

        # don't operate on data if given the same units
        if self.units == new_units:
            return self.data

        conversion_factor = get_conversion_factor(self.units, new_units)

        return self.data * conversion_factor