How do I multiply elements in a list with each other?
ex:
If I have to lists
[4, 0.8, 23]
[0.3, 2, 3]
How do I make these lists become a new list which should be [1.2, 1.6, 69]
Hello,
you can try this:
a = [4, 0.8, 23]
b = [0.3, 2, 3]
c = list(map(lambda x: x[0] * x[1], zip(a, b)))
print(c)
Best Regards,
Nicolas TATARENKO
Hi @
Olavv
You can do this using numpy
Here is answer:
import numpy as np
input1 = np.array([4, 0.8, 23])
input2 = np.array([0.3, 2, 3])
result = input1*input2
print(result)
Itertools & operator:
from itertools import starmap
from operator import mul
a = [4, 0.8, 23]
b = [0.3, 2, 3]
c = list(starmap(mul, zip(a, b)))
List comprehension:
a = [4, 0.8, 23]
b = [0.3, 2, 3]
c = [x * y for x, y in zip(a, b)]
With a for-loop and a list:
a = [4, 0.8, 23]
b = [0.3, 2, 3]
c = []
for x, y in zip(a, b):
result = x * y
c.append(result)With a generator
from functools import reduce
from operator import mul
def mul_seq(*sequences):
iterator = zip(*sequences)
for multiplicators in iterator:
yield reduce(mul, multiplicators)
a = [4, 0.8, 23]
b = [0.3, 2, 3]
c = list(mul_seq(a, b))
# or with more than two
d = list(mul_seq(a, b, c))If you have big arrays, you should better use numpy, because this is optimized for matrix operation like broadcasting or matrix multiplication.