Answered Essay: PYTHON 3 QUESTIONS

PYTHON 3 QUESTIONS

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R-2.13 Exercise R-2.12 asks for an implementation of _mul_-, for the Vector class of Section 2.3.3, to provide support for the syntax v + 3. Implement the rmulmethod, to provide additional support for syntax 3 v. R-2.14 Implement the _.mul._ method for the Vector class of Section 2.3.3, so that the expression u * v returns a scalar that represents the dot product of the vectors, that is, Σ-1 14 . vi.

Expert Answer

R-2.13

class vector(object):
def __init__(self,an_array):
self.a = an_array # of length 5
self.s = 5

def __mul__(self,that):
tmp = [0]*self.s
for i in range(self.s):
tmp[i] = self.a[i]*that.a[i]
return tmp

def __rmul__(self,that):
tmp = [0]*self.s
for i in range(self.s):
tmp[i] = self.a[i]*that
return tmp

x = vector([2,3,5,10,6])
c = 3*x
print(c)

R-2.14

import operator
sum_of_vectors = sum(map(operator.mul, [10,34,23,1], [10, 20, 30, 40]))
print(sum_of_vectors)

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