[R] grep

[Sundar Dorai-Raj]

Ernesto Jardim wrote:

> Hi,
> 
> I want to use the first digit of the elements of a vector.
> 
> I've tried grep but didn't work.
> 
> Any help is welcome.
> 
> Thanks
> 
> EJ
> 
> 
>>grep("^[0-9]",as.character(runif(100,0,2)))
> 
>   [1]   1   2   3   4   5   6   7   8   9  10  11  12  13  14  15  16 
> 17  18
>  [19]  19  20  21  22  23  24  25  26  27  28  29  30  31  32  33  34 
> 35  36
>  [37]  37  38  39  40  41  42  43  44  45  46  47  48  49  50  51  52 
> 53  54
>  [55]  55  56  57  58  59  60  61  62  63  64  65  66  67  68  69  70 
> 71  72
>  [73]  73  74  75  76  77  78  79  80  81  82  83  84  85  86  87  88 
> 89  90
>  [91]  91  92  93  94  95  96  97  98  99 100
> 

Not surprising. Try ?substring instead.

substring(runif(100, 0, 2), 1, 1)

-sundar