On 03/05/2011 4:43 PM, Jun Shen wrote:
Dear list,
This may sound silly. What is the right way to change the names of a
dataframe? Let's say I have this data frame (dose) with four columns with
names "ID", "DOSE", "TIME" "CMT". I want to change "DOSE" to "AMT". So I did
names(dose[2])<-'AMT'
But nothing happened. The name of the second column is still "DOSE".
Only this works
names(dose)[2]<-'AMT'
I wonder what is wrong with the first method. Thanks.
The first method says:
1. Get dose[2]. This is a dataframe consisting of the second column of
dose. Store it in a temporary, unnamed variable.
2. Changes its names to 'AMT'. This changes the names of the temporary
variable, which then disappears.
The second method says:
1. Set the second element of the names associated with dose to 'AMT'.
That's what you want to do.
Duncan Murdoch
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