1+1
[1] 2
23*786
[1] 18078
log(10)
[1] 2.302585
log10(10)
[1] 1
l1<-c(1,7,89)
l2<-c(12,-7,18)
l1+l2
[1] 13 0 107
l1*l2
[1] 12 -49 1602
100+l1
[1] 101 107 189
100+3*l1
[1] 103 121 367
l3<-c(2,6,8,9)
l1+l3
longer object length is not a multiple of shorter object length
[1] 3 13 97 10
1:100
[1] 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17
[18] 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34
[35] 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51
[52] 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68
[69] 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85
[86] 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100
\[ \sum_{i=1}^{n}i=1+2+\cdots+n=\frac{n(n+1)}{2} \]