[R] getting a variable from an object named using paste
costas at mit.edu
Sat Jul 9 16:44:36 CEST 2005
Indeed. Thanks and sorry,
PS. also, sorry about sending the original post twice... I did not
want to pollute the list any more with an apology then...
On 09 ÎÎ¿Ï
Î» 2005, at 3:30 ÎÎ, Uwe Ligges wrote:
> Constantinos Antoniou wrote:
>> The subject could be articulated better ;(, but I am stuck...
>> In any case, my problem is the following: I am trying to use knn,
>> and it requires a classification. So I am using cmeans for this.
>> What I want to do is add the classification as a new column in my
>> data.frame (to be used for knn). Now, the trick is that I would
>> like to name the output of the cmeans classification based on the
>> number of clusters (e.g. cmeans30 for 30 clusters). To do this, I
>> do the following:
>> [The file for this example can be downloaded from:
>> http://mit.edu/costas/www/station-1-120103.txt ]
>> lala <- read.csv("station-1-120103.txt",header=F)
>> ll <- cbind(lala$V25,lala$V22)
>> and sure enough if I type cmeans50 I get the output of this cmeans
>> This also works, naturally:
>> [and I now get three columns, where the third column is the
>> cluster ID.]
>> However, when I do what I really want (i.e. not call cmeans50
>> explicitly, but through the name that I constructed
>> llc <- cbind(ll,(paste("cmeans",num.of.clust,sep=""))$cluster)
> This is a FAQ: use get()
> Uwe Ligges
>> I only get two columns (the last term has no effect).
>> Any ideas as to what I am doing wrong?
>> Thanks a lot!
Constantinos Antoniou, Ph.D.
Massachusetts Institute of Technology
Intelligent Transportation Systems Program
77 Massachusetts Ave., Rm. 1-249, Cambridge, MA 02139
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