Eigen characters into least-square method












0












$begingroup$


I want to ask how to proove the $$widehat{z} $$
by using the eigen characters into least-square method?



Q:
$$y=Kz$$ where K is a nxn matrix and is a kernel with eigenfunctions
$$ lambda_m psi_m=Kpsi_m$$
and
$$intpsi_mpsi_n=delta_m,_n$$



that is
$$widehat{z}=sum_mlambda_m^{-1}y_mpsi_m $$



where
$$y_m=int y psi_m$$



I only could calculate that $$K^{-1}=lambda_m^{-1} $$
and why not just
$$z=K^{-1}y?$$










share|cite|improve this question









$endgroup$

















    0












    $begingroup$


    I want to ask how to proove the $$widehat{z} $$
    by using the eigen characters into least-square method?



    Q:
    $$y=Kz$$ where K is a nxn matrix and is a kernel with eigenfunctions
    $$ lambda_m psi_m=Kpsi_m$$
    and
    $$intpsi_mpsi_n=delta_m,_n$$



    that is
    $$widehat{z}=sum_mlambda_m^{-1}y_mpsi_m $$



    where
    $$y_m=int y psi_m$$



    I only could calculate that $$K^{-1}=lambda_m^{-1} $$
    and why not just
    $$z=K^{-1}y?$$










    share|cite|improve this question









    $endgroup$















      0












      0








      0





      $begingroup$


      I want to ask how to proove the $$widehat{z} $$
      by using the eigen characters into least-square method?



      Q:
      $$y=Kz$$ where K is a nxn matrix and is a kernel with eigenfunctions
      $$ lambda_m psi_m=Kpsi_m$$
      and
      $$intpsi_mpsi_n=delta_m,_n$$



      that is
      $$widehat{z}=sum_mlambda_m^{-1}y_mpsi_m $$



      where
      $$y_m=int y psi_m$$



      I only could calculate that $$K^{-1}=lambda_m^{-1} $$
      and why not just
      $$z=K^{-1}y?$$










      share|cite|improve this question









      $endgroup$




      I want to ask how to proove the $$widehat{z} $$
      by using the eigen characters into least-square method?



      Q:
      $$y=Kz$$ where K is a nxn matrix and is a kernel with eigenfunctions
      $$ lambda_m psi_m=Kpsi_m$$
      and
      $$intpsi_mpsi_n=delta_m,_n$$



      that is
      $$widehat{z}=sum_mlambda_m^{-1}y_mpsi_m $$



      where
      $$y_m=int y psi_m$$



      I only could calculate that $$K^{-1}=lambda_m^{-1} $$
      and why not just
      $$z=K^{-1}y?$$







      matrices eigenvalues-eigenvectors least-squares






      share|cite|improve this question













      share|cite|improve this question











      share|cite|improve this question




      share|cite|improve this question










      asked Dec 15 '18 at 14:29









      YuiYui

      135




      135






















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