Adding a new value to an array within a loop

Hi, this is my code. For each m, I am generating a random data set with 23 elements, then sum up the elements and add the sum to the array t1_0. However the resulting array has just the last added sum, all the other values are zeros. I cannot figure out what I am doing wrong. Many thanks for help.

clc; clear all;
rng('default') % initialize random number generator
A = 1.1; mn = 0; sd = 1; N = 23; 
m = 3;

t1_0 = zeros(m,1)
for i=1:m % generate m outcomes of the data set
   
    % generate a single data set under hypothesis H0
    x0 = randn(N,1)*sd + mn;            
   
    sum(x0)

    % statistic T1 under hypothesis H0    
    t1_0(m) = sum(x0);
end
t1_0
%T1_H0 = histogram(t1_0,50,'Normalization','pdf');

This is the output I get when I print out the values of sums for each m (m=3) and the final array:

ans =

13.4730

ans =

-1.9366

ans =

0.5020

t1_0 =

0

0

0.5020

Answer 1

[Rik]

You aren't correctly indexing:

%replace this
t1_0(m) = sum(x0);
%with this
t1_0(i) = sum(x0);

[VS]

Thanks!

Answer 2

[Mehmed Saad]

because you are passing m to t1_0 and value of m is constant through out the for loop. The index of your for loop is i in this case so replace m with i in t1_0

[VS]

Thanks!