Mastering NumPy: A Step-by-Step Learning Guide

Step 1: Installing NumPy

pip install numpy

Step 2: Importing NumPy

import numpy as np

Step 3: NumPy Arrays

1D Array

arr_1d = np.array([1, 2, 3])

2D Array

arr_2d = np.array([[1, 2, 3], [4, 5, 6]])

3D Array

arr_3d = np.array([[[1, 2, 3], [4, 5, 6]], [[7, 8, 9], [10, 11, 12]]])

Step 4: Array Operations

Element-wise Addition

result = arr_1d + arr_1d

Element-wise Multiplication

result = arr_2d * arr_2d

Dot Product of Matrices

result = np.dot(arr_2d, arr_2d.T)

Step 5: Saving and Loading Data

Saving Data

np.save('my_array', arr_1d)

Loading Data

loaded_array = np.load('my_array.npy')