/sci/ - Science & Math

>>15105003
There is a formula for the matrix that projects a vector onto a subspace. If your subspace is spanned by a set of vectors, you use those as the columns of a matrix A, and then [math]A(A^TA}^{-1}A^T[/math] (I forgot a T the first time) is your projection matrix

it's still a bit of a pain in the ass to do by hand, but I think it's reasonable to expect students to do on an exam. I'm pretty sure I had to