How to fill a 3D Array using a for loop

Hi, I've been having a problem filling a matrix. I need to fill it using a "for" loop, but the equations for each element is different. I hope the example can explain better what I pretend to achieve. Hope someone can help. Thanks.

for i=1:5
  k(i,1,1)=2*x(i);
  k(i,1,2)=9*y(i);
  k(i,2,1)=-2*x(i);
  k(i,2,2)=-2*y(i);
end

Answer 1

[KSSV]

x = rand(5,1) ;
y = rand(5,1) ;
k = zeros(2,2,2) ;
for i=1:5
  k(i,1,1)=2*x(i);
  k(i,1,2)=9*y(i);
  k(i,2,1)=-2*x(i);
  k(i,2,2)=-2*y(i);
end

What problem you face? Code is fine.

[Pedro Pires]

The weird thing is that without changing the code, it's now working fine. I can't remember exactly what the error was but I wasn't being able to give a value to the array members. Maybe some values or equations were preventing the script from working correctly. I sincerely can't see anything that I changed that could possibly make/solve the problem, but I'm also a beginners with Matlab. Thank you for the reply and help.