[R] strsplit and forward slash '/'

[Duncan Murdoch]

On 03/08/2011 12:37 PM, Federico Calboli wrote:
> Hi All,
>
> is there a way of using strsplit with a forward slash '/' as the splitting point?
>
> For data such as:
>
> 1      T/T    C/C  16/33
> 2      T/T    C/C  33/36
> 3      T/T    C/C  16/34
> 4      T/T    C/C  16/31
> 5      C/C    C/C  28/29
> 6      T/T    C/C  16/34
>
> strsplit(my.data[1,1], "/") # and any variation thereof
> Error in strsplit(apoe[1, 1], "/") : non-character argument

It looks as though your my.data[1,1] value is a factor, not a character 
value.

strsplit(as.character(my.data[1,1]), "/")

would work, or you could avoid getting factors in the first place, using the stringsAsFactors argument when you create the dataframe.

Duncan Murdoch


> Any advice will be gratefully received.
>
> Best wishes,
>
> Federico
>
>
> --
> Federico C. F. Calboli
> Department of Epidemiology and Biostatistics
> Imperial College, St. Mary's Campus
> Norfolk Place, London W2 1PG
>
> Tel +44 (0)20 75941602   Fax +44 (0)20 75943193
>
> f.calboli [.a.t] imperial.ac.uk
> f.calboli [.a.t] gmail.com
>
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