> Can someone explain why ∇Θ is only applied to the first term? It's not, there's an implied parenthesis: (∇_Θ)J = (∇_Θ)( yTy − (XΘ)Ty − yTXΘ + ΘT(XTX)Θ ). I

> Can someone explain why ∇Θ is only applied to the first term? It's not, there's an implied parenthesis: (∇_Θ)J = (∇_Θ)( yTy − (XΘ)Ty − yTXΘ + ΘT(XTX)Θ ). In the subsequent expressions you can see derivatives being taken of all the terms.