def quiet_evaluate(expr, vars, evaluation, expect_list=False):
""" Evaluates expr with given dynamic scoping values
without producing arithmetic error messages. """
expr = Expression('N', expr)
quiet_expr = Expression('Quiet', expr, Expression(
'List', Expression('MessageName', Symbol('Power'), String('infy'))))
value = dynamic_scoping(quiet_expr.evaluate, vars, evaluation)
if expect_list:
if value.has_form('List', None):
value = [chop(item).get_real_value() for item in value.leaves]
if any(item is None for item in value):
return None
return value
else:
return None
else:
return chop(value).get_real_value()
def eval_f(x_value, y_value):
value = stored.get((x_value, y_value), False)
if value == False:
value = dynamic_scoping(f.evaluate, {x: Real(x_value), y: Real(y_value)}, evaluation)
value = chop(value).get_real_value()
value = float(value)
stored[(x_value, y_value)] = value
return value
def eval_f(x_value, y_value):
value = stored.get((x_value, y_value), False)
if value == False:
value = dynamic_scoping(f.evaluate, {
x: Real(x_value),
y: Real(y_value)
}, evaluation)
value = chop(value).get_real_value()
value = float(value)
stored[(x_value, y_value)] = value
return value
def eval_f(f, x_value):
value = dynamic_scoping(f.evaluate, {x: x_value}, evaluation)
value = chop(value).get_real_value()
return value
def eval_f(f, x_value):
value = dynamic_scoping(f.evaluate, {x: x_value}, evaluation)
value = chop(value).get_real_value()
return value