Python Numpy.sqrt()  Square Root

Syntax of
numpy.sqrt()

Example Codes:
numpy.sqrt()

Example Codes:
numpy.sqrt()
Without
Parameter 
Example Codes:
numpy.sqrt()
With Negative Numbers 
Example Codes:
numpy.sqrt()
With Complex Numbers
Numpy.sqrt()
function calculates the square root of every element in the given array.
It is the inverse operation of Numpy.square()
method.
Syntax of numpy.sqrt()
numpy.sqrt(arr, out=None)
Parameters
arr 
input array 
out 
If out is given, the result will be stored in out . out should have the same shape as arr . 
Return
It returns an array of the square root of each element in the input array, even if out
is given.
Example Codes: numpy.sqrt()
import numpy as np
arr = [1, 9, 25, 49]
arr_sqrt = np.sqrt(arr)
print(arr_sqrt)
Output:
[1. 3. 5. 7.]
Example Codes: numpy.sqrt()
With out
Parameter
import numpy as np
arr = [1, 9, 25, 49]
out_arr = np.zeros(4)
arr_sqrt = np.sqrt(arr, out_arr)
print(out_arr)
print(arr_sqrt)
Output:
[1. 3. 5. 7.]
[1. 3. 5. 7.]
out_arr
has the same shape as arr
, and the square root of arr
is saved in it. And the numpy.sqrt()
method also returns the square root array, as shown above.
If out
doesn’t have the same shape as arr
, it raises a ValueError
.
import numpy as np
arr = [1, 9, 25, 49]
out_arr = np.zeros((2, 2))
arr_sqrt = np.sqrt(arr, out_arr)
print(out_arr)
print(arr_sqrt)
Output:
Traceback (most recent call last):
File "C:\Test\test.py", line 6, in <module>
arr_sqrt = np.sqrt(arr, out_arr)
ValueError: operands could not be broadcast together with shapes (4,) (2,2)
Example Codes: numpy.sqrt()
With Negative Numbers
import numpy as np
arr = [1, 9, 25, 49]
arr_sqrt = np.sqrt(arr)
print(arr_sqrt)
Output:
Warning (from warnings module):
File "..\test.py", line 5
arr_sqrt = np.sqrt(arr)
RuntimeWarning: invalid value encountered in sqrt
[nan nan nan nan]
It throws a RuntimeWarning
when the input is a negative number and returns nan
as a result.
Example Codes: numpy.sqrt()
With Complex Numbers
import numpy as np
arr = [3 + 4j, 5 + 12j, 8  6j, 15  8j]
arr_sqrt = np.sqrt(arr)
print(arr_sqrt)
Output:
[2.+1.j 2.+3.j 3.1.j 1.4.j]
A complex number has two square roots. For example,
numpy.sqrt()
method returns only one square root, which has a positive real number.
Founder of DelftStack.com. Jinku has worked in the robotics and automotive industries for over 8 years. He sharpened his coding skills when he needed to do the automatic testing, data collection from remote servers and report creation from the endurance test. He is from an electrical/electronics engineering background but has expanded his interest to embedded electronics, embedded programming and front/backend programming.
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