WP 34S Matrix

[lrdheat]

I have the WP 34S on my DM 42. I notice that the onboard library of applications include some Matrix utilities. Embarrassed to ask, but how do I utilize these capabilities? I want to load a 1 by choosable dimension, and then use RSUM (or equivalent) to divide each entry on the row to get portion of the total (it could be votes for various candidates, and RSUM would produce each candidate’s portion of the vote).