Subtract the mean of each row of a matrix?
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Subtract the mean of each row of a matrix?

Subtract the mean of each row of a matrix?

Subtract the mean of each row of a matrix

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Recipe Objective

While handling arrays, we might feel a need to subtract each element of row from its mean.

So this recipe is a short example on how to subtract the mean of each row of a matrix. 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(3, 4) print(a)

We have created a random array of size 3x4.

Step 3 - Subtracting mean

b = a - a.mean(axis=1, keepdims=True) print(b)

First, we find mean across each row and then subtract it from the original array. Finally, we are printing down the new array.

Step 4 - Lets look at our dataset now

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

Scroll down to the ipython file below to visualize the output.

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