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Negative Indexing | Indexing and Slicing
NumPy in a Nutshell
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NumPy in a Nutshell

NumPy in a Nutshell

1. Getting Started with NumPy
2. Dimensions in Arrays
3. Indexing and Slicing
4. Important Functions

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])
copy

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.

Tarefa

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.

Tarefa

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.

Mude para o desktop para praticar no mundo realContinue de onde você está usando uma das opções abaixo

Tudo estava claro?

Seção 3. Capítulo 5
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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])
copy

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.

Tarefa

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.

Tarefa

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.

Mude para o desktop para praticar no mundo realContinue de onde você está usando uma das opções abaixo

Tudo estava claro?

Seção 3. Capítulo 5
toggle bottom row

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])
copy

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.

Tarefa

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.

Tarefa

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.

Mude para o desktop para praticar no mundo realContinue de onde você está usando uma das opções abaixo

Tudo estava claro?

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])
copy

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.

Tarefa

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.

Mude para o desktop para praticar no mundo realContinue de onde você está usando uma das opções abaixo
Seção 3. Capítulo 5
Mude para o desktop para praticar no mundo realContinue de onde você está usando uma das opções abaixo
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