 Usage:  z = qp0 (H,f,A,b)  
 
 Input:

  H                      nxn matrix 
                         
  f                      nx1 matrix 
                         
  A                      kxn matrix 
                         
  b                      kx1 matrix 
                         
 Output:

  z                      nx1 matrix 
                         
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(C) MD*TECH Method and Data Technologies, 17.8.2000
