Question

Rewrite the following equation using vectors:

\[\theta_{j}:=\theta_{j}-\alpha \frac{1}{m}\sum_{i=1}^{m}{(h_{\theta}(x^{(i)})-y^{(i)})}x_{j}^{(i)}\]

Answer 1

Also, vectorize:

\[\sum_{i=1}^{5}{x_i}\]