Course Content

NumPy in a Nutshell

1. Getting Started with NumPy

What is NumPy?Function array()Basic Array Creation Quiz

2. Dimensions in Arrays

1-D Arrays Mathematical Operations with 1-D Arrays 2-D Arrays 3-D Arrays Multidimensional Arrays Quiz

3. Indexing and Slicing

Access Array Elements Match Math Operations Access 2-D and 3-D Arrays Match the Slicing Negative Indexing Match the Indices Get One Dimensional Array Using Slice and Only Positive Indexes Get One Dimensional Array Using Only Negative Indexes

4. Important Functions

Reshaping Flattening Joining Sorting Arrays Copying Arrays

Negative Indexing

We discussed positive indexing, but there is also negative indexing. Negative indexing starts from the end, with index -1 referring to the last element, index -2 referring to the second-to-last element, and so on.


              12345
            
import numpy as np

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

print(arr[-1 , -1])

This example illustrates how to retrieve a value of 10 from a given two-dimensional array using negative indexing.

The first index determines the row we choose (-1 refers to the last row), while the second index corresponds to the element we select within that row (-1 is the last one). As a result, we obtain a value of 10. Run the code above to verify it.

Task

You have the following array: [[-4, 3, 1], [2, 10, -4]]. Access the value 10.

Let's give it a try. Use only negative indices.

Task

You have the following array: [[-4, 3, 1], [2, 10, -4]]. Access the value 10.

Let's give it a try. Use only negative indices.

Switch to desktop for real-world practiceContinue from where you are using one of the options below

Everything was clear?

Section 3. Chapter 5

Negative Indexing


              12345
            
import numpy as np

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

print(arr[-1 , -1])

This example illustrates how to retrieve a value of 10 from a given two-dimensional array using negative indexing.

Task

You have the following array: [[-4, 3, 1], [2, 10, -4]]. Access the value 10.

Let's give it a try. Use only negative indices.

Task

You have the following array: [[-4, 3, 1], [2, 10, -4]]. Access the value 10.

Let's give it a try. Use only negative indices.

Switch to desktop for real-world practiceContinue from where you are using one of the options below

Everything was clear?

Section 3. Chapter 5

Negative Indexing


              12345
            
import numpy as np

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

print(arr[-1 , -1])

This example illustrates how to retrieve a value of 10 from a given two-dimensional array using negative indexing.

Task

You have the following array: [[-4, 3, 1], [2, 10, -4]]. Access the value 10.

Let's give it a try. Use only negative indices.

Task

You have the following array: [[-4, 3, 1], [2, 10, -4]]. Access the value 10.

Let's give it a try. Use only negative indices.

Switch to desktop for real-world practiceContinue from where you are using one of the options below

Everything was clear?


              12345
            
import numpy as np

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

print(arr[-1 , -1])

This example illustrates how to retrieve a value of 10 from a given two-dimensional array using negative indexing.

Task

You have the following array: [[-4, 3, 1], [2, 10, -4]]. Access the value 10.

Let's give it a try. Use only negative indices.

Switch to desktop for real-world practiceContinue from where you are using one of the options below

Section 3. Chapter 5

Switch to desktop for real-world practiceContinue from where you are using one of the options below