Mother's little helper (1)

If your dataset has thousands of columns, and you want to select a lot of them, then typing the name of each column when you call select() can be very tedious. Fortunately, select() has some helper functions to make it easy to select multiple columns without typing much code.

These helpers include starts_with() and ends_with(), that match columns that start or end with a certain prefix or suffix respectively. Due to dplyr's special code evaluation techniques, these functions can only be called from inside a call to select(); they don't make sense on their own.

Bu egzersiz

Introduction to Spark with sparklyr in R

kursunun bir parçasıdır

Kursu Görüntüle

Egzersiz talimatları

A Spark connection has been created for you as spark_conn. A tibble attached to the track metadata stored in Spark has been pre-defined as track_metadata_tbl.

Select all columns from track_metadata_tbl starting with "artist".
Select all columns from track_metadata_tbl ending with "id".

Uygulamalı interaktif egzersiz

Bu örnek kodu tamamlayarak bu egzersizi bitirin.

# track_metadata_tbl has been pre-defined
track_metadata_tbl

track_metadata_tbl %>%
  # Select columns starting with artist
  ___

track_metadata_tbl %>%
  # Select columns ending with id
  ___

Kodu Düzenle ve Çalıştır