[R] Aggregate

[Jim Lemon]

Apologies for this extended correspondence with myself.  I worked out
another solution.

binvec2dec<-function(binvec) {
 result<-0
 for(i in 1:length(binvec)) result<-result+binvec[i]*2^i
 return(result)
}
sum.response.patterns<-function(mat) {
 matdim<-dim(mat)
 sorted.mat<-mat[order(apply(mat,1,binvec2dec)),]
 sorted.mat<-cbind(sorted.mat,rep(1,matdim[1]))
 print(sorted.mat)
 j<-1
 rindex<-1:matdim[2]
 count.index<-matdim[2]+1
 for(i in 1:(matdim[1]-1)) {
  if(sum(abs(sorted.mat[i,rindex]-sorted.mat[i+1,rindex])) == 0)
   sorted.mat[j,count.index]<-sorted.mat[j,count.index]+1
  else {
   j<-j+1
   sorted.mat[j,]<-sorted.mat[i+1,]
  }
 }
 return(sorted.mat[1:j,])
}

I do hope that this is the right answer...

Jim

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