Log at Base 10

Utilize the log10() function to compute the logarithm with base 10.

Example

Calculate the base 10 logarithm of all elements in the following array:

import numpy as np

arr = np.arange(1, 10)

print(np.log10(arr))

Natural Log, or Log at Base e

Employ the log() function to calculate the logarithm with base e.

Example

Calculate the base e logarithm of all elements in the following array:

import numpy as np

arr = np.arange(1, 10)

print(np.log(arr))

Log at Any Base

NumPy does not offer a built-in function for calculating logarithms with an arbitrary base. However, we can use the frompyfunc() function in conjunction with the built-in math.log() function, which accepts two input parameters and returns one output parameter.

Example

from math import log
import numpy as np

nplog = np.frompyfunc(log, 2, 1)

print(nplog(100, 15))