def test_coalesce_decoalesce(self):
cvis = coalesce_visibility(self.blockvis,
time_coal=1.0,
frequency_coal=1.0)
assert numpy.min(cvis.frequency) == numpy.min(self.frequency)
assert numpy.min(cvis.frequency) > 0.0
dvis = decoalesce_visibility(cvis)
assert dvis.nvis == self.blockvis.nvis
dvis = decoalesce_visibility(cvis)
assert dvis.nvis == self.blockvis.nvis
def test_coalesce_decoalesce_singletime(self):
self.times = numpy.array([0.0])
self.blockvis = create_blockvisibility(
self.lowcore,
self.times,
self.frequency,
phasecentre=self.phasecentre,
weight=1.0,
polarisation_frame=PolarisationFrame('stokesI'),
channel_bandwidth=self.channel_bandwidth)
# Fill in the vis values so each can be uniquely identified
self.blockvis.data['vis'] = range(self.blockvis.nvis)
cvis = coalesce_visibility(self.blockvis, time_coal=1.0)
assert numpy.min(cvis.frequency) == numpy.min(self.frequency)
assert numpy.min(cvis.frequency) > 0.0
dvis = decoalesce_visibility(cvis)
assert dvis.nvis == self.blockvis.nvis
def test_coalesce_decoalesce_tbgrid_vis_null(self):
cvis = coalesce_visibility(self.blockvis, time_coal=0.0)
assert numpy.min(cvis.frequency) == numpy.min(self.frequency)
assert numpy.min(cvis.frequency) > 0.0
