[R] data frame question

[John Kane]

Create the new data.frame and do the muliplying on it?

df2 <- df1
df2[,1] <- df2[,1]*2

--- 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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