How to get the diagonal of a dot product?

This recipe helps you get the diagonal of a dot product

Recipe Objective

While handling arrays, we might need to find out the diagonal elemets of the dot product of two arrays. It can easily be done using numpy library.

So this recipe is a short example on how to get the diagonal of dot product. Let's get started.

Step 1 - Import the library


import numpy as np

Let's pause and look at these imports. Numpy is generally helpful in data manipulation while working with arrays. It also helps in performing mathematical operation.

Step 2 - Defining random array


a = np.random.rand(1000,200)
b = np.random.rand(200,200)

We have a defined two random arrays of variable size, one large and one small.

Step 3 - Finding the diagonal of dot product


print(np.diag(np.dot(a, b)))
print(a)

We have used dot function to calculate dot product and thereby diag function to find out the diagonal elements of the dot product.

Step 4 - Lets look at our dataset now

Once we run the above code snippet, we will see:

Scroll down the ipython notebook to visualize the output.

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