March 2018
Intermediate to advanced
528 pages
13h 2m
Portuguese (Portugal, Brazil)
Content preview from R para Data Science
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Selecionar Colunas com select() | 53
• starts_with("abc") combina nomes que comecem com “abc”.
• ends_with("xyz") combina nomes que terminem em “xyz”.
• co nt a i ns("ijk") combina nomes que contêm “ijk”.
•
m a t c h e s("(.)\\1") seleciona variáveis que combinem uma expressão regular. Esta
associa quaisquer variáveis que contenham caracteres repetidos. Você aprenderá
mais sobre expressões regulares no Capítulo 11.
• num_range("x", 1:3) combina x1, x2 e x3.
Veja ?select para mais detalhes.
select() pode ser usada para renomear variáveis, mas raramente é útil, porque deixa
de lado todas as variáveis que não forem mencionadas explicitamente. ...
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