How to "iterate" over submatrixes in matlab

I have 36x80 Matrix in Matlab. It consists of 3x2 arrays which are the symbols of the Braille. i.e.

0 0 0 1 0 1 0 0 .....
0 1 0 0 1 0 0 0 .....
0 1 0 1 0 1 1 1 .....
.....................

Where first 3x2 submatrix represent "p" letter

0 0 
0 1
0 1

Next is "r" and so on. And I have many of these "pattern" 3x2 matrixes which are represent Braille symbols.

How to translate that big matrix into matrix of English characters?

You can convert this matrix to a cell array like:

Bs = mat2cell(B,repelem(3,size(B,1)/3),repelem(2,size(B,2)/2));

Where B is your original matrix.

You have to prepare the Braille code in the same manner, so you can compare it to your matrix:

letters = {'p',[0 0;0 1;0 1];'r',[0 1;0 0;0 1]}; % ...and so on for all letters

Then you can loop over Bs:

txt = char(zeros(size(Bs))); % the result
for k = 1:numel(Bs)
    for l = 1:size(letters,1)
        if isequal(Bs{k},letters{l,2})
            txt(k) = letters{l,1};
            break
        end
    end
end

And here is another option, without converting your matrix to cell array:

BB = reshape(reshape(B,3,[]),3,2,[]);
txt = char(zeros(size(B,1)/3,size(B,2)/2)); % the result
for k = 1:size(BB,3)
    for l = 1:size(letters,1)
        if isequal(BB(:,:,k),letters{l,2})
            txt(k) = letters{l,1};
            break
        end
    end
end

This should be faster, especially if you have a lot of data.