Following by instructions here:
en.wikipedia.org/wiki/Projection_(linear_algebra)#Formulas counted that orthogonal projection should be equal to $((0), (1), (0), (0))\cdot (0, 1, 0, 0) \cdot ((0), (0), (1), (0))$, but that gives me $0$ as a result. Can someone tell me, what am I doing wrong?