Python ICRS.ravel方法代码示例

# 需要导入模块: from astropy.coordinates.builtin_frames import ICRS [as 别名]
# 或者: from astropy.coordinates.builtin_frames.ICRS import ravel [as 别名]
class TestManipulation():
    """Manipulation of Frame shapes.

    Checking that attributes are manipulated correctly.

    Even more exhaustive tests are done in time.tests.test_methods
    """

    def setup(self):
        lon = Longitude(np.arange(0, 24, 4), u.hourangle)
        lat = Latitude(np.arange(-90, 91, 30), u.deg)
        # With same-sized arrays, no attributes
        self.s0 = ICRS(lon[:, np.newaxis] * np.ones(lat.shape),
                       lat * np.ones(lon.shape)[:, np.newaxis])
        # Make an AltAz frame since that has many types of attributes.
        # Match one axis with times.
        self.obstime = (Time('2012-01-01') +
                        np.arange(len(lon))[:, np.newaxis] * u.s)
        # And another with location.
        self.location = EarthLocation(20.*u.deg, lat, 100*u.m)
        # Ensure we have a quantity scalar.
        self.pressure = 1000 * u.hPa
        # As well as an array.
        self.temperature = np.random.uniform(
            0., 20., size=(lon.size, lat.size)) * u.deg_C
        self.s1 = AltAz(az=lon[:, np.newaxis], alt=lat,
                        obstime=self.obstime,
                        location=self.location,
                        pressure=self.pressure,
                        temperature=self.temperature)
        # For some tests, also try a GCRS, since that has representation
        # attributes.  We match the second dimension (via the location)
        self.obsgeoloc, self.obsgeovel = self.location.get_gcrs_posvel(
            self.obstime[0, 0])
        self.s2 = GCRS(ra=lon[:, np.newaxis], dec=lat,
                       obstime=self.obstime,
                       obsgeoloc=self.obsgeoloc,
                       obsgeovel=self.obsgeovel)
        # For completeness, also some tests on an empty frame.
        self.s3 = GCRS(obstime=self.obstime,
                       obsgeoloc=self.obsgeoloc,
                       obsgeovel=self.obsgeovel)
        # And make a SkyCoord
        self.sc = SkyCoord(ra=lon[:, np.newaxis], dec=lat, frame=self.s3)

    def test_ravel(self):
        s0_ravel = self.s0.ravel()
        assert s0_ravel.shape == (self.s0.size,)
        assert np.all(s0_ravel.data.lon == self.s0.data.lon.ravel())
        assert np.may_share_memory(s0_ravel.data.lon, self.s0.data.lon)
        assert np.may_share_memory(s0_ravel.data.lat, self.s0.data.lat)
        # Since s1 lon, lat were broadcast, ravel needs to make a copy.
        s1_ravel = self.s1.ravel()
        assert s1_ravel.shape == (self.s1.size,)
        assert np.all(s1_ravel.data.lon == self.s1.data.lon.ravel())
        assert not np.may_share_memory(s1_ravel.data.lat, self.s1.data.lat)
        assert np.all(s1_ravel.obstime == self.s1.obstime.ravel())
        assert not np.may_share_memory(s1_ravel.obstime.jd1,
                                       self.s1.obstime.jd1)
        assert np.all(s1_ravel.location == self.s1.location.ravel())
        assert not np.may_share_memory(s1_ravel.location, self.s1.location)
        assert np.all(s1_ravel.temperature == self.s1.temperature.ravel())
        assert np.may_share_memory(s1_ravel.temperature, self.s1.temperature)
        assert s1_ravel.pressure == self.s1.pressure
        s2_ravel = self.s2.ravel()
        assert s2_ravel.shape == (self.s2.size,)
        assert np.all(s2_ravel.data.lon == self.s2.data.lon.ravel())
        assert not np.may_share_memory(s2_ravel.data.lat, self.s2.data.lat)
        assert np.all(s2_ravel.obstime == self.s2.obstime.ravel())
        assert not np.may_share_memory(s2_ravel.obstime.jd1,
                                       self.s2.obstime.jd1)
        # CartesianRepresentation do not allow direct comparisons, as this is
        # too tricky to get right in the face of rounding issues.  Here, though,
        # it cannot be an issue, so we compare the xyz quantities.
        assert np.all(s2_ravel.obsgeoloc.xyz == self.s2.obsgeoloc.ravel().xyz)
        assert not np.may_share_memory(s2_ravel.obsgeoloc.x,
                                       self.s2.obsgeoloc.x)
        s3_ravel = self.s3.ravel()
        assert s3_ravel.shape == (42,)  # cannot use .size on frame w/o data.
        assert np.all(s3_ravel.obstime == self.s3.obstime.ravel())
        assert not np.may_share_memory(s3_ravel.obstime.jd1,
                                       self.s3.obstime.jd1)
        assert np.all(s3_ravel.obsgeoloc.xyz == self.s3.obsgeoloc.ravel().xyz)
        assert not np.may_share_memory(s3_ravel.obsgeoloc.x,
                                       self.s3.obsgeoloc.x)
        sc_ravel = self.sc.ravel()
        assert sc_ravel.shape == (self.sc.size,)
        assert np.all(sc_ravel.data.lon == self.sc.data.lon.ravel())
        assert not np.may_share_memory(sc_ravel.data.lat, self.sc.data.lat)
        assert np.all(sc_ravel.obstime == self.sc.obstime.ravel())
        assert not np.may_share_memory(sc_ravel.obstime.jd1,
                                       self.sc.obstime.jd1)
        assert np.all(sc_ravel.obsgeoloc.xyz == self.sc.obsgeoloc.ravel().xyz)
        assert not np.may_share_memory(sc_ravel.obsgeoloc.x,
                                       self.sc.obsgeoloc.x)

    def test_flatten(self):
        s0_flatten = self.s0.flatten()
        assert s0_flatten.shape == (self.s0.size,)
        assert np.all(s0_flatten.data.lon == self.s0.data.lon.flatten())
#.........这里部分代码省略.........