MATLAB help with using nested loops in matricies

Ok I'm posting a second time as I was informed on my last post that I need to show my attempt of coding towards the part to recieve help. In part 3 of my workshop assignment, I've gotten as far as to get the first 10 rows in a z=zeros(20,10) but I am unsure on what to do to get the remaining 10 rows at the bottom as they all still display zeros.

My code is as follows:

z=zeros(20,10);

for x = 1:10

for y=1:10

z(x,y)=2*x+y^2;

end

end

disp(z)

and this is what it looks like when I click run:

Answer 1

[Fangjun Jiang]

for x = 1:size(z,1)

[Blake Sewell]

Thankyou very much, appreciated <3