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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