Fuzzy System Python Assertion Error During Input

I have built a fuzzy control system that takes three inputs (x,y,z) that accept (poor, average, or good) values and returns one output (w) with (low, average, or high) value. unfor

Solution 1:

First problem is a typo,

z = ctrl.Antecedent(np.arange(0,1,0.001), 'y')    # should be 'z'!

Now the code, when run, returns

ValueError: Crisp output cannot be calculated, likely because the system is too sparse.
 Check to make sure this set of input values will activate at least one connected Term
 in each Antecedent via the current set of Rules.

... because

wResults.input['y'] = 0.7     # classifies as "decent",
                              # and you haven't given any relevant rules