Concatenating matrices unable to create a row jump

Im trying to concatenate different matrices for a local otsu method segmentation but I cannot join the matrices for my subimages.This error is displayed: Dimensions of arrays being concatenated are not consistent.

Winex and winey is how many subwindows I need in the x and y axis, winsize is an input and determines how big the subwindows will be.

l = 0;
for i=1:winex
    for o=1:winey
        l = l + 1;
        tigger{i, o} = img((l-1)*winsize+1:l*winsize, (i-1)*winsize+1:i*winsize);
    end
    l = 0;
end
cruzzi = [];
for i=1:winex
    for o=1:winey
        carrey = graythresh(tigger{i, o});
        cruzzi{i} = [cruzzi imbinarize(tigger{i,o}, carrey)];
    end    
end
mmcd = winex-1;
while mmcd ~= 0
    alfin = [cruzzi{mmcd+1}
        cruzzi{mmcd}];
    mmcd = mmcd - 2;
end

Answer 1

[Walter Roberson]

cruzzi = [];

Numeric array.

        cruzzi{i} = [cruzzi imbinarize(tigger{i,o}, carrey)];

First cycle, cruzzi is the empty numeric array, and the [] operation works. You would be assigning to cell index 1 relative to the empty numeric cruzzi, but as a special case when the target is empty double then instead of MATLAB complaining about wrong data types, it will go ahead and convert cruzzi to a cell array. So after the assignment statement, cruzzi will stop being an empty numeric array and will start being a 1 x 1 cell array.

Then, second iteration, [cruzzi imbinarize(tigger{i,o}, carrey)] will be [] between (all of) a 1 x 1 cell and a numeric array. The result in cruzzi{1} would be the imbinarize() result from the first iteration, and in cruizzi{2} would be a 1 x 2 cell array...

You are either going to eventually get errors between concatenating between cells and doubles of different sizes, or else you are going to get cruzzi being a chain of (mostly) cell arrays that refer to each other.

If you want to append a numeric array to a cell array, then initialize the cell array as a cell and use

       cruzzi{end+1} = imbinarize(tigger{i,o}, carrey);