[R] dataframe question

[David Winsemius]

On Feb 7, 2010, at 7:51 PM, Vadlamani, Satish {FLNA} wrote:

> Folks:
> Good day. Please see the code below. three_wk_out is a dataframe  
> with columns wk1 through wk209. I want to change the format of the  
> columns. I am trying the code below but it does not work.  I need  
> $week in the for loop interpreted as wk1, wk2, etc. Could you please  
> help? Thanks.
> Satish
>
> R code below
> week_list <- paste("wk",c(1:209),sep="")


Or more "functionally":

three_wk_out <- as.data.frame( lapply(three_wk_out, some_function) )

E.g.:
 > df
   a b c x
1 1 0 0 1
2 2 3 2 4
3 1 2 1 5
4 2 0 3 2

 > df <- as.data.frame(lapply(df, "^", 2))
 > df
    a  b  c   x
1  1  0  0   1
2 16 81 16 256
3  1 16  1 625
4 16  0 81  16


> for (week in week_list)
> {
>        three_wk_out$week <- as.numeric(three_wk_out$week)
> }
>
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