[R] questions about string handling

[Michael Bedward]

How about this ("df" is your input data.frame)

data.frame(ID=df[,1], apply(df[,2:4], 2, function(x) c("00", "AA",
"GG", "CC", "TT")[match(x, c("0/0", "1/1", "2/2", "3/3", "4/4"))]))

Michael

On 5 August 2010 10:55, karena <dr.jzhou at gmail.com> wrote:
>
> Hi, I have a question about the data handling. I have a dataset as following:
> ID         snp1        snp2           snp3
> 1001     0/0           1/1            1/1
> 1002     2/2           3/3            1/1
> 1003     4/4           3/3            2/2
>
> I want to convert the dataset to the following format:
> ID        snp1         snp2           snp3
> 1001     00            AA             AA
> 1002     GG            CC            AA
> 1003     TT            CC            GG
>
> thing to be done:
> 1) take the '/' off
> 2) replace the numbers with letters, 0 not change.   1=A, 2=G, 3=C, 4=T
>
> what is the most efficient way to do it?
>
> thanks you very much,
>
> karena
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