[R] how to indice the column in the data.frame

[Joshua Wiley]

Hi,

Look at ?"["

anadata <- newdata[, cmn]
## i.e., extract all rows (the first argument is empty of the 2 column
anadata <- newdata[, 2]

Hope this helps,

Josh

On Tue, Nov 15, 2011 at 8:02 AM, haohao Tsing <haohaorain at gmail.com> wrote:
> hi R,users
>  Now I read a data from a txt file
> newdata<-read.table("1.txt")
> in the 1.txt ,there are several column shown as below
> 1 3 4 5
> 2 3 5 6
> 4 5 6 7
> so when I want analysis the second column
> anadata<-newdata$V2
>
> but my question I can not use some certain variable to indice the column?
> e.g
> cmn=2
> anadata<-newdata$Vcmn
>
> how can I finish this command ?can anyone help me ? thank yo .
>
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-- 
Joshua Wiley
Ph.D. Student, Health Psychology
Programmer Analyst II, ATS Statistical Consulting Group
University of California, Los Angeles
https://joshuawiley.com/