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/*
-- Title : [R3.3] 주요 R 내장 함수
-- Reference : hrd-net
-- Key word : R 내장 함수 내장함수 seq rnorm runif sample min max range mean median prod factorial abs sd sqrt colmeans colsums summary 평균 중위수 팩토리얼 절대값 표준편차 빈도수
*/

--R

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# ********************************************
# -- 주요 R 내장 함수  
# ********************************************
seq(-22, by=.2)              # 0.2씩 증가
seq(length=10from=-5, by=.2# -5부터 10개 생성 
rnorm(20, mean = 0, sd = 1)    # 정규분포를 따르는 20개 데이터 생성
runif(20, min=0, max=100)      # 0~100사이의 20개 난수 생성
sample(0:10020)              # 0~100사이의 20개 sample 생성
 
vec=1:10
min(vec)
max(vec)
range(vec)                     # 1 10
 
mean(vec)                      # 평균
median(vec)                    # 중위수
sum(vec) 
prod(vec)                      # 데이터의 곱
 
factorial(5)                   # 팩토리얼=120
abs(-5)                        # 절대값
sd(rnorm(10))                  # 표준편차 구하기 
table(vec)                     # 빈도수 
sqrt(16)                       # 4 
4^2                            # 16
5%%3                           # 나머지 구하기
 
excel = read.csv("D:\\RProject\\Rwork\\Part-I\\excel.csv", header = T)
head(excel,10
 
colMeans(excel[1:5])           # colMeans()함수 : 각 열의 평균 계산
colSums(excel[1:5])
 
summary(excel)                 # 요약통계량
cs

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