May 2022
Beginner to intermediate
667 pages
16h 17m
Korean
Content preview from R Cookbook
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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.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.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.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.
Cookbook
525
14.12 롤링 함수 적용하기
14.12
시계열에 롤링(
rolling
) 방식으로 함수를 적용하고 싶다. 즉, 어떤 데이터 점에서 주
변 시간 범위에 대해 해당 함수를 계산하고, 다음 데이터 점으로 넘어가서 그 점에서
함수를 계산하고, 그 다음 데이터 점으로 넘어가는 식이다.
zoo
패키지의
rollapply
함수를 사용한다.
width
는 시계열(
ts
) 중 해당 함수(
f
)에 의
해 각 점에서 계산될 데이터 점의 개수를 정의하는 인자다.
library(zoo)
rollapply(ts, width, f)
대개 여러분은
f
가 해당 시점에서 접근이 불가능한 데이터 레코드를 계산하는 걸 방
지하기 위해서
align = "right"
로 두게 될 것이다.
rollapply(ts,
width
, f, align = "right")
rollapply
함수는 시계열의 데이터에서 일정 ‘기간(
window
)’을 추출해서 그 데이터
를 가지고 함수를 호출하고, 결과를 저장한 뒤 그다음 기간으로 넘어간다. 그리고 입
력 전체에 대해서 이 패턴을 반복한다. 예시로
width = 21
로 지정한
rollapply
를 생
각해 보자.
rollapply(ts, 21, f)
rollapply
는 다음과 같이 기간을 이동하면서 반복적으로 함수
f
를 호출한다.
1
. ...
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
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.