x= c(1,3,5,7,9)
y= c(2,3,5,7,11,13)
z= c(9,3,2,5,9,2,3,9,1)
x+2
sum(5<x|x<3)
(7<y)
order(z)
y*3
y[3]
y[7<y]
unique(z)
length(x)
y[-3]
sort(z)
duplicated(z)
sum(5<x)
sum(3<y&y<11)
sort(z,dec=TRUE)
table(z)
sum(x[5<x])
y[x]
rev(z)
rep(z,3)




v0=c(51.4 ,64,71,82,98.7,pi)
v1=rep(c(5,6,3))
seq(1,10,2)