SciPy is an open-source Python library used to solve scientific and mathematical problems. It is built on NumPy and it allows us to manipulate and visualizing with a wide range of high-level commands. Scipy also provides a scipy.special.factorial() function to calculate factorial of any number.
scipy.special.factorial()
This function takes two parameters, int or array_like of int another Boolean and return the factorial of the given parameter as integer or float depending on boolean.
Syntax: scipy.special.factorial(n, exact=False)
Parameters:
n : int or array_like of ints
exact : bool, optional
Returns:
nf : float or int or ndarray (Output depending on exact).
Note: If Exact is True return integer value and if False it returns floating values with using the gamma function and default is False.
Example 1:
# importing module from scipy.special import factorial
print(factorial(3))
# False always return float value print(factorial(4, exact=False))
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Output :
6.0 24.0
Example 2: If exact value is True then it returns always an integer value.
# importing module from scipy.special import factorial
# True always return int value print(factorial(4, exact=True))
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Output :
24
Example 3: If we compute the negative value for factorial then it always returns zero.
# importing module from scipy.special import factorial
print(factorial(-3, exact=False))
print(factorial(-4, exact=True))
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Output :
0.0 0
Example 4: Get factorial for the array element.
# importing module import numpy as np
from scipy.special import factorial
# creating list list = [6, 3, 4, 5]
# creating NumPy Array arr = np.array(list)
# computing factorial and display print("Factorial value in float : ",
factorial(arr, exact=0))
print("Factorial value in Integer : ",
factorial(arr, exact=1))
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Output :
Factorial value in float : [720. 6. 24. 120.] Factorial value in Integer : [720 6 24 120]