NumPy is a python library used for working with arrays. It also has functions for working in the domain of linear algebra, fourier transform, and matrices. In this article, I hope to teach you the fundamentals of NumPy.

If you want to learn about Python first you can check out my beginners guide.

Getting Started

You need to have Python installed and PIP. If you have already done this you can start working with NumPy. Before you can use NumPy we have to install with the following command line:

C:\Users\Your Name>pip install numpy

Then open up a python script or file and import the library:

import numpy

Now, NumPy is imported and ready for you to use. NumPy usually is important as np instead of NumPy:

import numpy as np

We can check if NumPy works by adding two simple lines of code:

arr = np.array([1, 2, 3, 4, 5])

print(arr)
#output: [1 2 3 4 5]

Creating an Array

NumPy was developed to work with Arrays, so let’s create one with NumPy. An important thing to know is that NumPy uses the ‘ndarray’ object to create an array. You can create one as follows:import numpy as np #import the library

arr = np.array([1, 2, 3, 4, 5]) #initializing an ndarray

print(arr) #print the array

print(type(arr)) #output: <class 'numpy.ndarray'>

Multidimensional Arrays

A dimension in arrays is one level of array depth.

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