April 2025
Intermediate to advanced
578 pages
13h 35m
Portuguese (Portugal, Brazil)
library(tidyverse)library(babynames)
Content preview from R for Data Science, 2ª Edição
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Capítulo 14. Cordas
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Introdução
Até agora, usaste um monte de strings sem aprenderes muito sobre os seus detalhes. Agora está na hora de mergulhar neles, aprender o que faz as strings funcionarem e dominar algumas das poderosas ferramentas de manipulação de strings que tens à tua disposição.
Começaremos com os detalhes da criação de cadeias de caracteres e vectores de caracteres. Em seguida, mergulharás na criação de cadeias de caracteres a partir de dados e, depois, no oposto: extrair cadeias de caracteres de dados. De seguida, aborda as ferramentas que trabalham com letras individuais. O capítulo termina com funções que trabalham com letras individuais e uma breve discussão sobre onde as tuas expectativas do inglês te podem levar a errar quando trabalhas com outras línguas.
Continuaremos a trabalhar com strings no próximo capítulo, onde aprenderás mais sobre o poder das expressões regulares.
Pré-requisitos
Neste capítulo, vamos usar funções do pacote stringr, que faz parte do núcleo do tidyverse. Também vamos usar os dados babynames uma vez que fornece algumas strings divertidas para manipular.
Podes dizer rapidamente quando estás a utilizar uma função stringr porque todas as funções stringr começam por str_. Isto é particularmente útil se usares o RStudio porque ao escreveres str_ vais ativar o autocomplete, permitindo-te ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.