R version 2.10.0 (2009-10-26)
Copyright (C) 2009 The R Foundation for Statistical Computing
ISBN 3-900051-07-0

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> options(STERM='iESS', editor='emacsclient')
> x <- c("Jane", "Joe", "Bill")
> x
[1] "Jane" "Joe"  "Bill"
> x+x
Error in x + x : non-numeric argument to binary operator
> y <- c(1,2,3,4)
> sum(y*y)
[1] 30
> sum(y)
[1] 10
> y*y
[1]  1  4  9 16
> sum(y*y)
[1] 30
> z <- c(4,3,2,1)
> dot <- sum(y*z)
[1] 20
> dot <- sum(y*z)
> ?sum
> sum(c(1,2,3),c(4,5))
[1] 15
> ?NA
> sum(c(1,2,3),c(4,NA))
[1] NA
> sum(c(1,2,3),c(4,NA),na.rm=TRUE)
[1] 10
> y
[1] 1 2 3 4
> z
[1] 4 3 2 1
> crossprod(y,z)
     [,1]
[1,]   20
> ?crossprod
> 1:4
[1] 1 2 3 4
> x <- 1:10
 [1]  1  2  3  4  5  6  7  8  9 10
> x <- 1:10
> x
 [1]  1  2  3  4  5  6  7  8  9 10
> seq(1,10)
 [1]  1  2  3  4  5  6  7  8  9 10
> seq(1,10,by=2)
[1] 1
> seq(1,10,by=2)
[1] 1 3 5 7 9
> seq(1,100,by=2)
 [1]  1  3  5  7  9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39 41 43 45 47 49
[26] 51 53 55 57 59 61 63 65 67 69 71 73 75 77 79 81 83 85 87 89 91 93 95 97 99
> ?seq
> seq(from=1,to=100,by=2)
 [1]  1  3  5  7  9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39 41 43 45 47 49
[26] 51 53 55 57 59 61 63 65 67 69 71 73 75 77 79 81 83 85 87 89 91 93 95 97 99
> seq(to=100,from=1,by=2)
 [1]  1  3  5  7  9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39 41 43 45 47 49
[26] 51 53 55 57 59 61 63 65 67 69 71 73 75 77 79 81 83 85 87 89 91 93 95 97 99
> seq(100,1,by=2)
Error in seq.default(100, 1, by = 2) : wrong sign in 'by' argument
> seq(100,1,by=-2)
 [1] 100  98  96  94  92  90  88  86  84  82  80  78  76  74  72  70  68  66  64
[20]  62  60  58  56  54  52  50  48  46  44  42  40  38  36  34  32  30  28  26
[39]  24  22  20  18  16  14  12  10   8   6   4   2
> seq(1,10,length.out=30)
 [1]  1.000000  1.310345  1.620690  1.931034  2.241379  2.551724  2.862069
 [8]  3.172414  3.482759  3.793103  4.103448  4.413793  4.724138  5.034483
[15]  5.344828  5.655172  5.965517  6.275862  6.586207  6.896552  7.206897
[22]  7.517241  7.827586  8.137931  8.448276  8.758621  9.068966  9.379310
[29]  9.689655 10.000000
> prod(c(1,2,3,4))
[1] 24
> 0:20
 [1]  0  1  2  3  4  5  6  7  8  9 10 11 12 13 14 15 16 17 18 19 20
> (0:20)/365
 [1] 0.00000000 0.02777778 0.05555556 0.08333333 0.11111111 0.13888889
 [7] 0.16666667 0.19444444 0.22222222 0.25000000 0.27777778 0.30555556
[13] 0.33333333 0.36111111 0.38888889 0.41666667 0.44444444 0.47222222
[19] 0.50000000 0.52777778 0.55555556
> 1-(0:20)/365
 [1] 0.000000000 0.002739726 0.005479452 0.008219178 0.010958904 0.013698630
 [7] 0.016438356 0.019178082 0.021917808 0.024657534 0.027397260 0.030136986
[13] 0.032876712 0.035616438 0.038356164 0.041095890 0.043835616 0.046575342
[19] 0.049315068 0.052054795 0.054794521
> 1-(0:20)/365
 [1] 1.0000000 0.9972603 0.9945205 0.9917808 0.9890411 0.9863014 0.9835616
 [8] 0.9808219 0.9780822 0.9753425 0.9726027 0.9698630 0.9671233 0.9643836
[15] 0.9616438 0.9589041 0.9561644 0.9534247 0.9506849 0.9479452 0.9452055
> prod(1-(0:20)/365)
[1] 0.5563117
> 1-c(1,2,3,4)
[1]  0 -1 -2 -3
> prod(1-seq(0,20,by=1)/365)
[1] 0.5563117
> prod(1-seq(0,11,by=1)/365)
[1] 0.8329752
> prod(1-seq(0,10,by=1)/365)
[1] 0.8588586
>