Working with Vectors :

> x<- c(1,2,3)
> x
[1] 1 2 3
> x[2]
[1] 2
> y<- c(x,4)
> y
[1] 1 2 3 4
> y[5]
[1] NA
> y[-c(2:3)]                  # [ Excludes 2^nd and 3^rd value of y]
[1] 1 4

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