Return the natural logarithm of one plus the input array element-wise in Numpy



To return the natural logarithm of one plus the input array, element-wise., use the numpy.log1p() method in Python Numpy. It calculates log(1 + x).

For complex-valued input, log1p is a complex analytical function that has a branch cut [-inf, -1] and is continuous from above on it. log1p handles the floating-point negative zero as an infinitesimal negative number, conforming to the C99 standard.

Steps

At first, import the required library −

import numpy as np

Create an array using the array() method −

arr = np.array([1e-15, 10000, 1e-99])

Display the array −

print("Array...
", arr)

Get the type of the array −

print("
Our Array type...
", arr.dtype)

Get the dimensions of the Array −

print("
Our Array Dimension...
",arr.ndim)

Get the shape of the Array −

print("
Our Array Shape...
",arr.shape)

To return the natural logarithm of one plus the input array, element-wise., use the numpy.log1p() method. Calculates log(1 + x) −

print("
Result...
",np.log1p(arr))

Example

import numpy as np

# Create an array using the array() method
arr = np.array([1e-15, 10000, 1e-99])

# Display the array
print("Array...
", arr) # Get the type of the array print("
Our Array type...
", arr.dtype) # Get the dimensions of the Array print("
Our Array Dimension...
",arr.ndim) # Get the shape of the Array print("
Our Array Shape...
",arr.shape) # To return the natural logarithm of one plus the input array, element-wise., use the numpy.log1p() method in Python Numpy # Calculates log(1 + x). print("
Result...
",np.log1p(arr))

Output

Array...
[1.e-15 1.e+04 1.e-99]

Our Array type...
float64

Our Array Dimension...
1

Our Array Shape...
(3,)

Result...
[1.00000000e-15 9.21044037e+00 1.00000000e-99]

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