Coding Issues faced in Andrew Ng's course

I was going through Andrew's ML course on Coursera (Week 2). I attach with this post some snaps of my codes for the optional exercise part (of the programming assignment problems) for that week, namely, the codes for featureNormalize.m (4th image from top), computeCostMulti.m (2nd image from top), and gradientDescentMulti.m (3rd image from top), along with the outputs (1st image) that I obtained on submission, and a figure depicting the convergence of gradient descent (last image). Is something wrong with the codes for featureNormalize.m and gradientDescentMulti.m? I haven't received any feedback for these two, and I don't know what's that supposed to mean. (I haven't tried Normal Equations yet, so that one's ok).

P.S, I know that it is very stupid of me to post such a specific question on this platform, but I need an answer to it, and I can't post the codes on the User's Discussion Forum for the course on Coursera, for that violates the platform's Honor-Code.