How to set and check normal distribution on a data set? Sorry if my question is simple, I have a data set with two class and want to check and set normal distribution on it(if it was necessary, in MATLAB).

But the question is that I should use it on every rows or every column, it's 200 rows and 30 columns.
It's hard to be sure of anything without having a glimpse at your data but what I assume from what you are saying is:

you have 2 classes which probably are  given as 1 columns

you have 29 features

you have 200 samples
Edit: Then while writing my answer I'm not too sure what you wanna do. If you have 2 classes it is likely that you are about to do some classification tasks so I don't really get what you want to modelize with a normal distribution.