w3resource

NumPy: Compute the inner product of vectors for 1-D arrays and in higher dimension

NumPy: Linear Algebra Exercise-6 with Solution

Write a NumPy program to compute the inner product of vectors for 1-D arrays (without complex conjugation) and in higher dimension.

Sample Solution :

Python Code :

import numpy as np
a = np.array([1,2,5])
b = np.array([2,1,0])
print("Original 1-d arrays:")
print(a)
print(b)
print 
result = np.inner(a, b)
print("Inner product of the said vectors:")
x = np.arange(9).reshape(3, 3)
y = np.arange(3, 12).reshape(3, 3)
print("Higher dimension arrays:")
print(x)
print(y)
result = np.inner(x, y)
print("Inner product of the said vectors:")
print(result)

Sample Output:

Original 1-d arrays:
[1 2 5]
[2 1 0]
Inner product of the said vectors:
Higher dimension arrays:
[[0 1 2]
 [3 4 5]
 [6 7 8]]
[[ 3  4  5]
 [ 6  7  8]
 [ 9 10 11]]
Inner product of the said vectors:
[[ 14  23  32]
 [ 50  86 122]
 [ 86 149 212]]

Python Code Editor:


Have another way to solve this solution? Contribute your code (and comments) through Disqus.

Previous: Write a NumPy program to evaluate Einstein’s summation convention of two given multidimensional arrays.
Next: Write a NumPy program to compute the eigenvalues and right eigenvectors of a given square array.

What is the difficulty level of this exercise?

Test your Python skills with w3resource's quiz



Python: Tips of the Day

Getting the last element of a list:

some_list[-1] is the shortest and most Pythonic.

In fact, you can do much more with this syntax. The some_list[-n] syntax gets the nth-to-last element. So some_list[-1] gets the last element, some_list[-2] gets the second to last, etc, all the way down to some_list[-len(some_list)], which gives you the first element.

You can also set list elements in this way. For instance:

>>> some_list = [1, 2, 3]
>>> some_list[-1] = 5 # Set the last element
>>> some_list[-2] = 3 # Set the second to last element
>>> some_list
[1, 3, 5]

Note that getting a list item by index will raise an IndexError if the expected item doesn't exist. This means that some_list[-1] will raise an exception if some_list is empty, because an empty list can't have a last element.

Ref: https://bit.ly/3d8TfFP