Normal Equation Derivation with Calculus for Least Squares Regression

[@janneskleinau6332]

Thank you so much! That was really helpful!

[@ChuanLiu-r8b]

Thank you, but Is x^Tx invertable anytime? I reckon only when A is of full rank?

[@limlim5195]

thank you very much

[@zealous261]

I don't get how du†u/du=2u†

[@railitaylor]

It’s an identity. Look up matrix calculus identities and you’ll find it. :)