def test_sequence_as_expression(self):
def get_sympy(v):
return v.sympified_expression
t = sympy.Dummy('t')
times = {
t: 0.5,
't0': 0.3,
't1': 0.7,
't2': 1.3,
}
entries = [TableEntry(0, 0, None), TableEntry(1, 0, 'hold')]
self.assertEqual(
ExpressionScalar(0),
TableEntry._sequence_as_expression(
entries, get_sympy, t, pre_value=None,
post_value=None).sympified_expression.subs(times))
entries = [TableEntry(0, 1, None), TableEntry(1, 1, 'hold')]
self.assertEqual(
ExpressionScalar(1),
TableEntry._sequence_as_expression(
entries, get_sympy, t, pre_value=None,
post_value=None).sympified_expression.subs(times))
entries = [TableEntry(0, 0, None), TableEntry(1, 1, 'linear')]
self.assertEqual(
ExpressionScalar(.5),
TableEntry._sequence_as_expression(
entries, get_sympy, t, pre_value=None,
post_value=None).sympified_expression.subs(times))
entries = [
TableEntry('t0', 'a', 'linear'),
TableEntry('t1', 'b', 'linear'),
TableEntry('t2', 'c', 'hold')
]
self.assertEqual(
ExpressionScalar('(a+b)*.5'),
TableEntry._sequence_as_expression(
entries, get_sympy, t, pre_value=None,
post_value=None).sympified_expression.subs(times))
def _as_expression(self) -> Dict[ChannelID, ExpressionScalar]:
t = self._AS_EXPRESSION_TIME
shape = (len(self.defined_channels),)
expressions = {}
for i, channel in enumerate(self._channels):
def value_trafo(v):
try:
return v.underlying_expression[i]
except TypeError:
return IndexedBroadcast(v.underlying_expression, shape, i)
pre_value = value_trafo(self._entries[0].v)
post_value = value_trafo(self._entries[-1].v)
pw = TableEntry._sequence_as_expression(self._entries,
expression_extractor=value_trafo,
t=t,
post_value=post_value,
pre_value=pre_value)
expressions[channel] = pw
return expressions