 Usage:  {Q,R} = qrmat(y,aux)  
 
 Input:

  y                      n x p matrix. y must be the output of qr(...). 
                         
  aux                    p x 1 vector. 
                         
 Output:

  Q                      n x p matrix. Q is an orthogonal matrix of the QR 
                         decomposition. 
                         
                         
  R                      p x p matrix. R is an upper triangular matrix of the QR 
                         decomposition. 
                         
                         
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(C) MD*TECH Method and Data Technologies, 17.8.2000
