[R] creating a new column

[Schmitt, Corinna]

Hallo,

if you work with matrix you can use cbind to add columns.

Corinna

  


-----Ursprüngliche Nachricht-----
Von: r-help-bounces at stat.math.ethz.ch [mailto:r-help-bounces at stat.math.ethz.ch] Im Auftrag von raymond chiruka
Gesendet: Montag, 7. Mai 2007 16:28
An: r
Betreff: [R] creating a new column

hie l would like to create a 6th column "actual surv time" from the following data 
  
  the condition being
  if  censoringTime>survivaltime then actual survtime =survival time
  else actual survtime =censoring time
  
  the code l used to create the data is
  
       s=2
       while(s!=0){ n=20
         m<-matrix(nrow=n,ncol=4)
         colnames(m)=c("treatmentgrp","strata","censoringTime","survivalTime")
        for(i in 1:20)  m[i,]<-c(sample(c(1,2),1,replace=TRUE),sample(c(1,2),1,replace=TRUE),rexp(1,.007),rexp(1,.002))
        m<-cbind(m,0)
         m[m[,3]>m[,4],5]<-1
         colnames(m)[5]<-"censoring"
      print(m)
       s=s-1
          treatmentgrp strata censoringTime survivalTime censoring
   [1,]             1      1       1.012159    1137.80922         0
   [2,]             2      2      32.971439     247.21786         0
   [3,]             2      1      85.758253     797.04949         0
   [4,]             1      1      16.999171      78.92309         0
   [5,]             2      1     272.909896     298.21483         0
   [6,]             1      2     138.230629     935.96765         0
   [7,]             2      2      91.529859     141.08405         0
  
  
  l keep getting an error message when i try to  create the 6th column
  
  
  
  
 	      
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