#R assignmment operators
x= 3 + 4
x

x <- 3 +4
x

switch ('a', 'a' = {x = x + 5;},
        'b' = {x = 999}, 'c' = {x = 'ABC'})
x

m1 <- m2 <- 3
m1 = m2 <- 3
m1 <- m2 = 3

mean(1:5) #used to save memory as a function assignment
mean(x <-1:5) #used as a variable assignment

mean(1:5) #not using variable

x <- y <-5 #statement is oke
a = b = 5 #statement is oke
m = n <-5 #statement is oke
p <- q = 5 #Error in p <- q = 5 : 找不到物件 'p'

#Logical Vector
c(T, F, TRUE, FALSE)

#Integer Vector
c(1L, 2L, 3L, 4L, 0xaL)

#Numeric Vector
c(1.0, .1, 1e-2, 1e2, 1.2e2)