What is Hstack in python?

This recipe explains what is Hstack in python

Recipe Objective

While operating with arrays, we might be interested in adding a column to an array. It can be easily done by hstack.

So this recipe is a short example to understand hstack in python. 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 - Setup the Data


a = np.ones((3, 3))
b= np.array((2,2,2)).reshape(3,1)

Here, we are creating two simple arrays.

Step 3 - Using Hstack


print(np.hstack( (a,b) ))

Here, we have simply added column b to array a using hstack.

Step 4 - Let's look at our dataset now

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

[[1. 1. 1. 2.]
 [1. 1. 1. 2.]
 [1. 1. 1. 2.]]

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