CODEWITHSUNDEEP
python
Tony
Tony

Reputation: 117

error inputting array element into recursive function

I am trying to pass an array element into a recursive function that calculates the factorial and it outputs 0. There is a warning that says that there is an overflow encountered in long_scalars. Whenever I pass a hard coded number into the function, it seems to work fine though. Does anyone know why this is happening or how to fix it? 

rand_10 = np.random.randint(100,500,10)

array([173, 171, 375, 432, 393, 334, 268, 341, 183, 270])

def fact(x):
  if x == 1:
    return 1
  else:
    return x * fact(x-1)

fact(rand_10[0])

RuntimeWarning: overflow encountered in long_scalars

Output: 0

Edit: I read through the link provided in the possible duplicate. I still can't figure out how to resolve the issue. How and where should I set the dtype as int64 if that's the resolution to it?

Upvotes: 1

Views: 96

Answers (1)

codrelphi
codrelphi

Reputation: 1065

Here is the working code:

import numpy as np

rand_10 = np.random.randint(100,500,10, dtype=np.int64)

def fact(x):
    if x == 1:
        return 1
    else:
        return x * fact(x-1)

x = rand_10[0].item()   # method item() to convert the value into a native Python type
print(fact(x))

rand_10[0] returns the type numpy.int64. So, you need to convert it to a native Python type (i.e. int) by using the method item()

Best regards!

Upvotes: 1

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