[R] data frame question

From: joseph <jdsandjd_at_yahoo.com>
Date: Thu, 14 Feb 2008 09:12:23 -0800 (PST)

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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