Hi Mat,

The following should get you started:

> s <- "Mercedes_02352"
> substr(s, nchar(s) - 3, nchar(s) - 1)
[1] "235"
>

> # defining a function
> foo <- function(x, a = 3, b = 1) substr(s, nchar(x) - a, nchar(x) - b)
> foo(s)
[1] "235"

HTH,
Jorge.-


On Wed, Jan 30, 2013 at 8:05 PM, Mat <> wrote:

> Hello together,
>
> i have a question for "substring".
> I know i can filter a number like this one:
> bill$No<-substring(bill$Customer,2,4)
>
> in this case i get the 2nd, 3rd and 4th number of my Customer ID.
> But how can i do this, if i want the 2nd, 3rd and 4th number of a column.
>
> Like this one.
> I have: Mercedes_02352
> Audi_03555
> and now i want to filter this data.frame to
> 235
> 355
>
> can you help me?
>
> Thanks.
>
> Mat
>
>
>
> --
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>
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