I understand that you want to import multiple 2-D datasets and store them in a 3-D matrix. The approach you are following is right except for the fact that the initialization of 'u' and 'v' arrays with zeros should be done only once outside the for loop. For example, your code should be modified as follows:
u = zeros(29, 39, 26);
v = zeros(29, 39, 27);
for k=1:26
filename = sprintf('Angle1-%d.mat', k);
data = load(filename);
u(:, :, k) = data.u;
v(:, :, k) = data.v;
end
In your code, since you are initializing 'u' and 'v' arrays with zeros in each iteration of a for loop, the data added to these matrices is getting wiped out with zeros and only data in the last iteration is stored as control comes out of the for loop.
