程序控制
————————————————————
for
> for (n in x) + print(n^2) [1] 1 [1] 4 [1] 16
while
> x <- 1 > while(x<3){ + print(x) + x = x+1 + } [1] 1 [1] 2
if else
subset、which取值
m<-seq(1,20,by=2) > m [1] 1 3 5 7 9 11 13 15 17 19 > subset(m,m>5) [1] 7 9 11 13 15 17 19 > m[which(m>5)] [1] 7 9 11 13 15 17 19
apply