[R] controling the size of vectors in a matrix

From: raymond chiruka <rtchiruka_at_yahoo.com>
Date: Thu, 17 May 2007 02:40:11 -0700 (PDT)


hie R users      

    l have the following matrix

          n=20
          m<-matrix(nrow=n,ncol=4)
          colnames(m)=c("treatmentgrp","strata","survivalTime")                  
              for(i in 1:n) m[i,]<-c(sample(c(1,2),1,replace=TRUE),sample(c(1:2),1,replace=TRUE),rexp(1,0.07),rexp(1,0.02))                                                                  
   
          print(m)
      1.l would like to control the size of the treatment variable eg treatment 1=size 5 treatment 2=size 15.
    

    2. l would also want to control the size of the strata ie in treatment 1 divide the strata in to 2 etc.     

    3. For the survival time l would like to have treatment 1-strata 1 using a different rate from treatment 2 -strata 2 etc to generate the survival time.     

    the program l used above does nt do this so if you can help  



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