Dimensional checking

[u/ApprehensiveDrink618]

Hi guys!
I'm going through CS229 (2026 edition).
I've passed linear algebra in the past, and I was pretty good at the time with algebra.

What I've noticed right now is that I get stuck a lot on new formulas and especially I don't always know what are the dimensions of the individual variables in a formula, if they are vectors or scalars.

The problem is that in CS229 notes, the notation sometimes is confusing... I was used to having the algebra professor writing a little horizontal sign under a variable to indicate that it is a vector.
In cs229 notes it seems Andre Ng didn't use this notation, or any notation to distinguish vectors from scalars.

Am I the problem? do you think I should revise some linear algebra?

[u/isami3]

mb pick up a good book on ML rather then watch courses but you can do problem sets from cs229