def evaluate(self):
"""recursively iterates through all parentheses, evaluating the \
innermost parenthetical phrase first and working its way back \
to the outermost"""
try:
return float(self.phrase)
except ValueError:
while self.has_parenthesis():
index = self.get_nested_index()
if str(self.terms[index][0]) == "-":
#there may be some issues with the type casting here
try:
self.terms[index] = -1 * \
(float(RawEvaluator(eqn_helper.unshell(\
self.terms[index])).evaluate()))
except ValueError:
self.terms[index] = -1 * \
(complex(RawEvaluator(eqn_helper.unshell(\
self.terms[index])).evaluate()))
else:
self.terms[index] = \
RawEvaluator(eqn_helper.unshell(self.terms[index])).evaluate()
index = 0
terms = self.terms.copy()
operators = self.operators.copy()
#iterates through the term and operator equations,
#trimming them as it goes
while len(terms) > 1 and len(operators) > 0:
index = self.get_op_index(operators)
terms[index] = self.operate(operators[index], terms[index],\
terms[index+1])
if index < len(terms):
del(terms[index+1])
del(operators[index])
#returns the last remaining dreg of the term equation
return terms[0]
def eval_function(self, phrase):
"""evaluates a given function by splitting it into its term and its
function component, then using the appropriate pre-defined math
operation"""
#manages the sign of the output
sign = 1.0
if phrase[0] == "-":
funct = phrase[1:phrase.index("(")]
sign = -1.0
#gets everything before the first parenthesis in the phrase
else:
funct = phrase[:phrase.index("(")]
#gets / evaluates the term as the item inside the parentheses;
#if the term is a summation, handles that separately so as not
#to evaluate the terms inside beforehand
if funct != "sum":
term = Function(eqn_helper.unshell(phrase),\
cpx = self.complex, asimp = self.asimp,\
constants = self.constants).evaluate()
else:
return sign * self.eval_sum(phrase)
try:
return sign * eqn_helper.simple_functions[funct](term)
except TypeError:
return sign * eqn_helper.complex_functions[funct](term)
except KeyError:
if funct == "norm":
if type(term) != type(Vector(0)):
term = Vector(term[0:len(term)])
result = str(term.normalize() * sign)
if result[0] == '<':
result = result[1:len(result)-1]
return result
else:
if funct == 'sum':
print(term)
return self.eval_sum(str(term))
except ValueError:
print('Value Error.')
return 0
except ZeroDivisionError:
print('Zero Division Error.')
return 0
return term
