select
데이터 프레임 중 원하는 열을 선택하는 방법은 패키지를 깔지 않아도 되는데,,, 더 편한 방법을 제공하기 위한 거겠지 뭐... 뭐가 더 편한지 한번 보자
all variable name check
dplyr을 사용하지 않았을 때의 선택 방법은 좀 복잡하다
select by variable name
-
는 그 변수를 제외한 나머지 변수를 선택하게 됩니다.
:
기호는 두 개 변수 사이에 있는 모든 변수를 선택합니다.
:
기호는 -
와 사용하여 제외하는 방법으로 사용할 수 있습니다.
select by index number
select by index number with -
starts_with / ends_with : 특정 문자로 시작하거나 끝나는 변수만을 선택합니다.
contains, matches : 특정 문자를 포함하는 변수만을 선택합니다.
one_of : 다른 벡터를 통해 추출할 이름을 불러옵니다.
%23%20select2%0A%0A@%5B%uD2F0%uC2A4%uD1A0%uB9AC%5D%0A%0A----%0A%0A%uD2B9%uC815%20%uBB38%uC790%uB85C%20%uC2DC%uC791%uD558%uAC70%uB098%20%uB05D%uB098%uB294%20%uBCC0%uC218%uB9CC%uC744%20%uC120%uD0DD%uD569%uB2C8%uB2E4.%0A%60%60%60r%0A%23%20%uBCC0%uC218%uBA85%uC774%20%22c%22%uB85C%20%uC2DC%uC791%uD558%uB294%20%uACBD%uC6B0%uB9CC%20%uCD94%uCD9C%0Amtcars_varName%20%3C-%20select%28mtcars%2C%20starts_with%28%22c%22%29%29%0Anames%28mtcars_varName%29%0A%60%60%60%0A%21%5BAlt%20text%5D%28./20180315114359.png%29%0A%0A%60%60%60r%0A%23%20%uBCC0%uC218%uBA85%uC774%20%22l%22%uB85C%20%uB05D%uB098%uB294%20%uACBD%uC6B0%uB9CC%20%uCD94%uCD9C%0Amtcars_varName%20%3C-%20select%28mtcars%2C%20ends_with%28%22l%22%29%29%0Anames%28mtcars_varName%29%0A%60%60%60%0A%21%5BAlt%20text%5D%28./20180315114404.png%29%0A%0A----%0A%0A%uD2B9%uC815%20%uBB38%uC790%uB97C%20%uD3EC%uD568%uD558%uB294%20%uBCC0%uC218%uB9CC%uC744%20%uC120%uD0DD%uD569%uB2C8%uB2E4.%0A%60%60%60r%0A%23%20%uBCC0%uC218%uBA85%uC5D0%20%22a%22%uB97C%20%uD3EC%uD568%uD558%uB294%20%uACBD%uC6B0%uB9CC%20%uCD94%uCD9C%28%uB9E8%uC55E/%uB9E8%uB4A4%20%uC0C1%uAD00%uC5C6%uC74C%29%0Amtcars_varName%20%3C-%20select%28mtcars%2C%20contains%28%22a%22%29%29%0Anames%28mtcars_varName%29%0A%60%60%60%0A%21%5BAlt%20text%5D%28./20180315114942.png%29%0A%0A%0A%60%60%60r%0A%23%20%uBCC0%uC218%uBA85%uC5D0%20%22a%22%uB97C%20%uD3EC%uD568%uD558%uB294%20%uACBD%uC6B0%uB9CC%20%uCD94%uCD9C%0A%23%20%22.%22%uC744%20%uBD99%uC774%uB294%20%uACBD%uC6B0%20%uC911%uAC04%uC744%20%uC758%uBBF8%20%28%uC544%uB798%20%uC608%uC2DC%uC5D0%uC11C%uB294%20%uB9E8%uC55E/%uB9E8%uB4A4%20%uC81C%uC678%uB418%uACE0%20%uC911%uAC04%uB9CC%29%0Amtcars_varName%20%3C-%20select%28mtcars%2C%20matches%28%22.a.%22%29%29%0Anames%28mtcars_varName%29%0A%60%60%60%0A%21%5BAlt%20text%5D%28./20180315114949.png%29%0A%0A----%0A%0A%uB2E4%uB978%20%uBCA1%uD130%uB97C%20%uD1B5%uD574%20%uCD94%uCD9C%uD560%20%uC774%uB984%uC744%20%uBD88%uB7EC%uC635%uB2C8%uB2E4.%0A%60%60%60r%0A%23%20%uBCC0%uC218%uBA85%uC744%20%uB2F4%uC740%20%uBCA1%uD130%uB97C%20one_of%uB97C%20%uD1B5%uD574%20%uCD94%uCD9C%0A%23%20%uC774%uB984%uC774%20%uB9E4%uCE6D%uB418%uC9C0%20%uC54A%uC744%20%uACBD%uC6B0%2C%20%uC6CC%uB2DD%uC73C%uB85C%20%uC54C%uB824%uC90C%0Avari_name%20%3C-%20c%28%22mpg%22%2C%20%22cyl%22%29%0Amtcars_varName%20%3C-%20select%28mtcars%2C%20one_of%28vari_name%29%29%0Anames%28mtcars_varName%29%0A%60%60%60%0A%21%5BAlt%20text%5D%28./20180315115733.png%29%0A
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