

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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