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Scaling















                                                                                                          '
                                   Scaling operation:                                                  x =        ax



                                                                                                       y =        by
                                                                                                           '





                                   Or, in matrix form:





                                                                                            x'            a 0                    x 


                                                                                                     =                             

                                                                                            y'              0          b         y 








                                                                                                      scaling matrix S



                                   What’s inverse of S?
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