FYI: Matlab/Octave users...

[samirbajaj]

If you're using Matlab or Octave for the Linear Regression exercises, you may already know that it offers a built-in function to compute the pseudo-inverse of a matrix (the "X dagger" in the lectures).

Type 'help pinv' for more information.

Thanks.

-Samir

[dvs79]

Thanks, samirbajaj.

I don't know if there's any significant saving of computing time, using pinv(x) instead of inv(x'*x)*x', but definitely pinv looks nicer