On Aug 18, 2011, at 1:36 AM, Jie TANG wrote:
for example:
a data.frame
data
V1 V2 V3
1 2 3
4 5 6
If I want to calculate the V2
I can get data$V2
But now I want to calculate the dimension name and then analysis the
data.
for example
No=3*x ;x=1,2,3,...n
anadata=data$VNo
How could I do?
If you are asking how to access the n-th column then try this:
data[[n]] # returns a vector
or
data[1:5] # returns a dataframe
You could also use:
vname <- paste("V", 1:5, sep="")
data[vname]
This does suggest that yoy need to read your introductory material
more closely, because this would be covered in an early chapter.
--
David Winsemius, MD
West Hartford, CT
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