Question

Code for creation of cell arrays taken from:
Array of Matrices in MATLAB
[Thank you Hosam Aly!]

The function is:

function result = createArrays(nArrays, arraySize)
    result = cell(1, nArrays);
    for i = 1 : nArrays
        result{i} = zeros(arraySize);
    end
end

My code:

   a=createArrays(49,[9,9]);

    a{1}(1,1) = 0.01 + 1.*rand(1,1);
    a{1}(2,2) = 0.01 + 1.*rand(1,1);
    a{1}(3,3) = 0.01 + 1.*rand(1,1);
    a{1}(4,4) = 0.01 + 1.*rand(1,1);
    a{1}(5,5) = 0.01 + 1.*rand(1,1);
    a{1}(6,6) = 0.01 + 1.*rand(1,1);
    a{1}(7,7) = 0.01 + 1.*rand(1,1);
    a{1}(8,8) = 0.01 + 1.*rand(1,1);
    a{1}(9,9) = 0.01 + 1.*rand(1,1);

I cannot use a{:}(1,1) to refer to all matrices. Matlab finds using { } an unexpected parenthesis when using loops.

I’d like to keep the format as above for the diagonal. What should I do?

Answer 1

The best thing I can see is just to loop through all your cells:

for i = 1:49
 a{i}(1,1) = ...
end

But why use cells when you can just do a 3D matrix?

a = zeros(49,9,9);

a(:,2,2) = something