readxl (2)

Introduzione all'importazione dei dati in R

Filip Schouwenaars

Instructor, DataCamp

read_excel()

read_excel(path, sheet = 1, 
           col_names = TRUE, 
           col_types = NULL, 
           skip = 0)

Schermata 2019-07-15 alle 15.27.34.png

read_excel() - col_names

read_excel(path, sheet = 1, 
           col_names = TRUE, 
           col_types = NULL, 
           skip = 0)

col_names = FALSE: R assegna i nomi
col_names = vettore di caratteri: specifica manualmente

read_excel() - col_types

read_excel(path, sheet = 1, 
           col_names = TRUE, 
           col_types = NULL, 
           skip = 0)

read_excel("cities.xlsx", col_types = c("text", "text"))

# A tibble: 4 × 2
    Capital Population
      <chr>      <chr>
1  New York   16044000
2    Berlin    3433695
3    Madrid    3010492
4 Stockholm    1683713

read_excel() - col_types

read_excel(path, sheet = 1, 
           col_names = TRUE, 
           col_types = NULL, 
           skip = 0)`

read_excel("cities.xlsx", 
             col_types = c("text", "blank"))

# A tibble: 4 × 1
    Capital
      <chr>
1  New York
2    Berlin
3    Madrid
4 Stockholm

read_excel() - skip

read_excel(path, sheet = 1, 
           col_names = TRUE, 
           col_types = NULL, 
           skip = 0)

read_excel("cities.xlsx", 
             col_names = c("Capital", "Population"),
             skip = 2)

# A tibble: 3 × 2
    Capital Population
      <chr>      <dbl>
1    Berlin    3433695
2    Madrid    3010492
3 Stockholm    1683713

Riepilogo

excel_sheets()
read_excel()
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Veloce
Stessi argomenti del pacchetto readr
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Ayo berlatih!

Introduzione all'importazione dei dati in R