code: public DoubleMatrix2D getR() {
  		if(this.rescaler==null){
  			if (this.R == null) {
  				this.R = ColtUtils.dcsToMatrix(N.U);
  			}
  			return this.R;
  		}
  		//not able to find the original decomposition A=QR with the appropriate properties of Q and A 
  		//from the rescaled entities
  		throw new RuntimeException("not implemented");
  		
  	}
docs: Returns a copy of the upper triangular factor, <tt>R</tt>.
  
  @return <tt>R</tt>