> ?c
> q=-2:7
> ?seq
> r=seq(1,25,2)
> q
 [1] -2 -1  0  1  2  3  4  5  6  7
> r
 [1]  1  3  5  7  9 11 13 15 17 19 21 23 25
> mesh=seq(0,1,0.10)
> mesh
 [1] 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
> mesh=seq(0,1,0.01)
> mesh
  [1] 0.00 0.01 0.02 0.03 0.04 0.05 0.06 0.07 0.08 0.09 0.10 0.11
 [13] 0.12 0.13 0.14 0.15 0.16 0.17 0.18 0.19 0.20 0.21 0.22 0.23
 [25] 0.24 0.25 0.26 0.27 0.28 0.29 0.30 0.31 0.32 0.33 0.34 0.35
 [37] 0.36 0.37 0.38 0.39 0.40 0.41 0.42 0.43 0.44 0.45 0.46 0.47
 [49] 0.48 0.49 0.50 0.51 0.52 0.53 0.54 0.55 0.56 0.57 0.58 0.59
 [61] 0.60 0.61 0.62 0.63 0.64 0.65 0.66 0.67 0.68 0.69 0.70 0.71
 [73] 0.72 0.73 0.74 0.75 0.76 0.77 0.78 0.79 0.80 0.81 0.82 0.83
 [85] 0.84 0.85 0.86 0.87 0.88 0.89 0.90 0.91 0.92 0.93 0.94 0.95
 [97] 0.96 0.97 0.98 0.99 1.00
> evens=seq(2,100,2)
> evens
 [1]   2   4   6   8  10  12  14  16  18  20  22  24  26  28  30
[16]  32  34  36  38  40  42  44  46  48  50  52  54  56  58  60
[31]  62  64  66  68  70  72  74  76  78  80  82  84  86  88  90
[46]  92  94  96  98 100
> mesh[evens]
 [1] 0.01 0.03 0.05 0.07 0.09 0.11 0.13 0.15 0.17 0.19 0.21 0.23
[13] 0.25 0.27 0.29 0.31 0.33 0.35 0.37 0.39 0.41 0.43 0.45 0.47
[25] 0.49 0.51 0.53 0.55 0.57 0.59 0.61 0.63 0.65 0.67 0.69 0.71
[37] 0.73 0.75 0.77 0.79 0.81 0.83 0.85 0.87 0.89 0.91 0.93 0.95
[49] 0.97 0.99
> exp(mesh)
  [1] 1.000000 1.010050 1.020201 1.030455 1.040811 1.051271
  [7] 1.061837 1.072508 1.083287 1.094174 1.105171 1.116278
 [13] 1.127497 1.138828 1.150274 1.161834 1.173511 1.185305
 [19] 1.197217 1.209250 1.221403 1.233678 1.246077 1.258600
 [25] 1.271249 1.284025 1.296930 1.309964 1.323130 1.336427
 [31] 1.349859 1.363425 1.377128 1.390968 1.404948 1.419068
 [37] 1.433329 1.447735 1.462285 1.476981 1.491825 1.506818
 [43] 1.521962 1.537258 1.552707 1.568312 1.584074 1.599994
 [49] 1.616074 1.632316 1.648721 1.665291 1.682028 1.698932
 [55] 1.716007 1.733253 1.750673 1.768267 1.786038 1.803988
 [61] 1.822119 1.840431 1.858928 1.877611 1.896481 1.915541
 [67] 1.934792 1.954237 1.973878 1.993716 2.013753 2.033991
 [73] 2.054433 2.075081 2.095936 2.117000 2.138276 2.159766
 [79] 2.181472 2.203396 2.225541 2.247908 2.270500 2.293319
 [85] 2.316367 2.339647 2.363161 2.386911 2.410900 2.435130
 [91] 2.459603 2.484323 2.509290 2.534509 2.559981 2.585710
 [97] 2.611696 2.637944 2.664456 2.691234 2.718282
> 
> a=1:4
> b=c(2,3,4,7)
> a
[1] 1 2 3 4
> b
[1] 2 3 4 7
> a+b
[1]  3  5  7 11
> a-b
[1] -1 -1 -1 -3
> a*b
[1]  2  6 12 28
> a/b
[1] 0.5000000 0.6666667 0.7500000 0.5714286
> 
> d=c(1,10)
> a+d
[1]  2 12  4 14
> 
> f=c(1,2,9)
> a+f
[1]  2  4 12  5
Warning message:
In a + f : longer object length is not a multiple of shorter object length
> 
> 10*a+b
[1] 12 23 34 47
>