cumulative sum in a loop

c = 1;
while c <= 5
    i = 1;
    while i <= 10,
        z = rand(1, 10);
        Z(c, i) = z(i) % how to get this to add the previous c=1 if this is c=2 loop to be cumulative sum
    end
end

example:

C = 1 Z1 Z2 Z3 Z4 Z5 Z6 Z7 Z8 Z9 Z10
C = 2 Z1 + Z1'   Z2+Z2' Z3 + Z3'      ( Z' is a new random number)
C = 3 Z1 + Z1'+Z1''

[Rik]

Two questions: Why are you using while loops, and why don't you generate a larger random matrix, so you can reference previous values.

Is this a homework question? If it is, could you post the original question as well? And have you looked at how you might be able to tweak a call to cumsum?

[Joseph Lee]

how do i generate a larger cumulative matrix? this is just a short summary of a part of code for project, for each loop theres calculations involving related equations that uses the random number. I need to generate random number for each loop and to save it at the end, then use it for the next set of loop for cumulative sum.

Answer 1

[Andrei Bobrov]

Z = rand(10,1,10);
Z_add = randi(5,2,10);

out = cumsum([Z;Z_add]);

with for - loop

m = 5;

Z = randi(20,1,10);
n = size(Z,2);
Z_out = [Z;zeros(m-1,n)];
for ii = 2:m
    Z_out(ii,:) = Z_out(ii-1,:) + randi(5,1,n);
end