Hey Seungryul,
I understand that you are trying to compute reduced row echelon form (RREF) of an input 3d matrix, but is getting an error saying, “Variable y must be of size [3 3 9], It is currently of size [3 3 8]”
The error message indicates that the size of the variable ‘intermediates’ is incorrect. It is expected to have a size of ‘[3 3 9]’, but it currently has a size of ‘[3 3 8].’
The issue arises because the ‘intermediates’ variable is initialized with an empty matrix and then assigned values within the loop, but the loop does not count the initial empty matrix when incrementing ‘icount.’
To resolve this issue, you can initialize ‘intermediates’ with the correct size with ‘zeros’ or ‘ones’ and then assign the value to in within the loop.
Consider the following code:
function intermediates = rref337i(A)
[m, n] = size(A);
pivot_cols = zeros(1, 0);
pivot_count = 0;
icount = 1;
intermediates = zeros(m, n, m + 1); % Initialize intermediates with the correct size
intermediates(:, :, icount) = A;
% rest would be same as you did
Hope this helps.
