How to normalize a matrix in numpy?

How to normalize a matrix in numpy?

How to normalize a matrix in numpy?

This recipe helps you normalize a matrix in numpy


Recipe Objective

Normalization is a process of organizing the data in a database to avoid data redundancy, insertion anomaly, update anomaly & deletion anomaly. Many a times, it becomes unavoidable when dealing with large datasets especially image processing.

So this recipe is a short example on how to to normalize matrix in numpy. 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

df= np.random.random((3,3)) print("Original Array:") print(df)

We have a created a simple 3x3 matrix in form of an array, containing random values.

Step 3 - Performing Normalization

dfmax, dfmin = df.max(), df.min() df = (df - dfmin)/(dfmax - dfmin) print(df)

For normalization, the calculation follows as subtracting each element by minimum value of matrix and thereby dividing the whole with difference of minimum and maximum of whole matrix.

Step 4 - Printing matrix

print("After normalization:") print(df)

We are simply trying to print normalized array in here.

Step 5 - 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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