[R] data frame question

[Henrique Dallazuanna]

If I understand:

df2 <- transform(df1, col3=col1*2)

On 14/02/2008, joseph <jdsandjd at yahoo.com> wrote:
>
>
>  Hi
>
>  I have a data frame df1 in which I would like to multiply col1
>  by 2.
>
>
>  The way I did it does not allow me to keep the old data
>  frame.
>
>
>  How can I do this and be able to create a new data frame
>  df2?
>
>
>  > df1= data.frame(col1= c(3, 5, NA, 1), col2= c(4, NA,6,
>  2))
>
>
>  > df1
>
>
>   col1 col2
>
>
>  1    3    4
>
>
>  2    5   NA
>
>
>  3   NA    6
>
>
>  4    1    2
>
>
>  > df1$col1=df1$col1*2
>
>
>  > df1
>
>
>   col1 col2
>
>
>  1    6    4
>
>
>  2   10   NA
>
>
>  3   NA    6
>
>
>  4    2    2
>
>
>
>
>
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-- 
Henrique Dallazuanna
Curitiba-Paraná-Brasil
25° 25' 40" S 49° 16' 22" O