Numeric vectors 

c(1.2,3.5,5.0,6.7,1.09e-3)

[1] 1.20000 3.50000 5.00000 6.70000 0.00109

x <- c(1.2,3.5,5.0,6.7,1.09e-3)
length(x)

[1] 5

1:100

  [1]   1   2   3   4   5   6   7   8   9  10  11  12  13  14  15  16  17  18
 [19]  19  20  21  22  23  24  25  26  27  28  29  30  31  32  33  34  35  36
 [37]  37  38  39  40  41  42  43  44  45  46  47  48  49  50  51  52  53  54
 [55]  55  56  57  58  59  60  61  62  63  64  65  66  67  68  69  70  71  72
 [73]  73  74  75  76  77  78  79  80  81  82  83  84  85  86  87  88  89  90
 [91]  91  92  93  94  95  96  97  98  99 100

x <- c(1,2,3,4,5)
y <- c(3,2,3,2,3)
z <- x + y
print(z)

[1] 4 4 6 6 8

x <- c(3,2,4,8,7)
y <- x + 1
print(y)

[1] 4 3 5 9 8

x <- c(3,2,4,8,7)
y <- x + c(1,1,1,1,1)
print(y)

[1] 4 3 5 9 8

1 + NA

[1] NA

x <- c(-2,-1,0,1,2)
1/x

[1] -0.5 -1.0  Inf  1.0  0.5

x/0

[1] -Inf -Inf  NaN  Inf  Inf