[R] Generate a sequence of random integer values

[(Ted Harding)]

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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E-Mail: (Ted Harding) <Ted.Harding at nessie.mcc.ac.uk>
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Date: 28-May-04                                       Time: 17:33:52
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