RE: [R] Generate a sequence of random integer values

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From: Ted Harding (Ted.Harding@nessie.mcc.ac.uk)
Date: Sat 29 May 2004 - 02:33:52 EST


Message-id: <XFMail.040528173352.Ted.Harding@nessie.mcc.ac.uk>


On 28-May-04 Brian Davenhall wrote:
> I'm trying to generate a sequence of random integer values. I've
> tried to combine the random (r) and the sequence (seq) functions
> but this approach does not work. For example, if I use the
> following command:
>
>> a <- seq(1:100)
>> a
> [1] 1 2 3 4 5 6 7 8 9 etc.
>
> This is a good start, but what I really want is something that
> would look like this instead
>
> [1] 3 96 45 67 8 24 99 63 8, etc.
>
> where the integer numbers between 1 and 100 are randomly chosen.
>
> Any help would be great, I've found workarounds in other stat packages,
> but would prefer to do this in R.

(1:100)[sort(runif(100),index.return=TRUE)$ix]

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

but there may be a slicker way ...
Ted.

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Date: 28-May-04 Time: 17:33:52
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