def test_convert_decoalesce_zero(self):
cvis = convert_blockvisibility_to_visibility(self.blockvis)
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(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_with_iter(self):
for rows in vis_timeslice_iter(self.blockvis):
visslice = create_visibility_from_rows(self.blockvis, rows)
cvisslice = convert_blockvisibility_to_visibility(visslice)
assert numpy.min(cvisslice.frequency) == numpy.min(self.frequency)
assert numpy.min(cvisslice.frequency) > 0.0
dvisslice = decoalesce_visibility(cvisslice)
assert dvisslice.nvis == visslice.nvis
def test_convert_weight(self):
cvis = convert_blockvisibility_to_visibility(self.blockvis)
model = create_image_from_visibility(
vis=cvis,
npixel=256,
cellsize=0.001,
phasecentre=self.phasecentre,
polarisation_frame=PolarisationFrame('stokesI'))
cvis = weight_visibility(cvis, model)
assert numpy.mean(cvis.data['imaging_weight']) < 1.0
assert numpy.std(cvis.data['imaging_weight']) > 0.0
dvis = decoalesce_visibility(cvis)
assert numpy.mean(dvis.data['imaging_weight']) < 1.0
assert numpy.std(dvis.data['imaging_weight']) > 0.0
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