29 Mar NumPy Tutorial

NumPy is an open-source Python library, that allows you to work with multi-dimensional arrays and matrices, with the mathematical functions operating on these arrays. It stands for Numerical Python and is written in Python and C.

NumPy Tutorial Index

NumPy Introduction

Installing NumPy with pip

Installing NumPy with PyCharm

How to create NumPy arrays

• Create an array using the array() by passing the tuple
• Create an array using the array() by passing the list

Dimensions in Arrays

• Create a Zero-Dimensional NumPy array
• Create a One-Dimensional NumPy array
• Check how many dimensions the array has

Initialize NumPy array

• Initialize NumPy arrays with zeros

Access NumPy array elements (Indexing)

• Access elements from a One-Dimensional array
• Access elements from a Two-Dimensional array
• Access elements from a Three-Dimensional array
• Access an array from the last with Negative Indexing

Array Slicing

• Syntax
• Slicing Examples
• STEP – array slicing
• Slicing 2D arrays with step

Datatypes in NumPy

• Get the data type of a NumPy array with an integer
• Get the data type of a NumPy array with strings
• Set the datatype size within a NumPy array
• Convert one datatype to another

Shape of a NumPy array

• Checking the shape of a 1d NumPy array
• Checking the shape of a 2d array

Rehape a NumPy array

• Why reshape?
• Example1: Reshape dimensions from One-Dimensional to Two-Dimensional
• Example 2: Convert 3D Array to 1D array (Flattening the array)

How to Iterate NumPy Arrays?

• Iteration on One-Dimensional NumPy array
• Iteration on Two-Dimensional NumPy array
• Iteration on Three-Dimensional NumPy array

Joining NumPy Arrays

• Concatenate – Joining NumPy Arrays
• Stack – Joining NumPy Arrays

Split NumPy Array

• Split 1D array
• Access split 1D array
• Split 2D array

Search a NumPy Array for a value

Sorting NumPy Arrays

• Sorting a 1D NumPy Integer Array
• Sorting a 1D NumPy strings Array
• Sorting a 2D array

Axes in NumPy Arrays

• Getting minimum value with axes

Intersection of Arrays

• Find the intersection between two arrays
• Find the intersection also sorts the resultant array
• Find the intersection between two arrays with different elements

Difference between Arrays

• Syntax
• Find the difference between 2 arrays
• Finding the difference between two arrays (n2 -n1)

Arithmetic Operations on NumPy arrays

• Adding NumPy arrays
• Subtracting NumPy arrays
• Multiply NumPy arrays
• Divide NumPy arrays

Scalar operations on NumPy array

• Adding a value to each element of a NumPy array
• Subtracting a value from each element of a NumPy array
• Multiplying a value to each element of a NumPy array
• Dividing a value from each element of a NumPy array

Math Operations on NumPy array

• Mean
• Median
• Standard Deviation

Random module

• Generate Random numbers
• Generate a random array with a fixed size
• Generate one of the random values based on an array of values

NumPy Logs

• Log: Base 2
• Log: Base 10

NumPy LCM and HCF

• HCF/ GCD of two numbers in NumPy