R - (5) If, else if, switch

5. If, if else, switch

If 문

x <- 30L
if(is.integer(x)) {
   print("X is an Integer")
}

[1] "X is an Integer"

If else 문

x <- c("what","is","truth")

if("Truth" %in% x) {
   print("Truth is found")
} else {
   print("Truth is not found")
}

[1] "Truth is not found"

Switch 문

switch 문은 일반적인 C, Java등의 프로그래밍 언어와는 조금 다르다.

# by index
switch(1, "one", "two")
## [1] "one"


# by index with complex expressions
switch(2, {"one"}, {"two"})
## [1] "two"


# by index with complex named expression
switch(1, foo={"one"}, bar={"two"})
## [1] "one"


# by name with complex named expression
switch("bar", foo={"one"}, bar={"two"})
## [1] "two"

아래 튜토리얼을 참고한 포스팅입니다. 

https://www.tutorialspoint.com/r/r_operators.htm