merge multiple doubles in one cell of different sizes

Question

Wang Ryan 2024-8-5

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https://ww2.mathworks.cn/matlabcentral/answers/2142946-merge-multiple-doubles-in-one-cell-of-different-sizes

评论： Garmit Pant 2024-8-6

I created a cell using for loop:

clearvars;
for i=1:30 
    p = double(DSC00080); 
    X=4912; Y=3264;d=i;  	
    r = p(:,:,1); % Red channel
    g = p(:,:,2); % Green channel
    b = p(:,:,3); % Blue channel
    dr{i}= r(1:Y,1:X-d)+r(1:Y,1+d:X)  ; 
    dg{i}= g(1:Y,1:X-d)+g(1:Y,1+d:X)  ; 
    db{i}= b(1:Y,1:X-d)+b(1:Y,1+d:X)  ; 
end

it gives me a cell of 30 doubles with slight diiference in the size, as shown in the image.

Now I need to merge all 30 doubles in the cell into 1 double of 3264*4911. Could anyone tell me how to do it? many thanks.

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KSSV 2024-8-5

What exactly you are trying to do? What is DSC00080?

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Answer 1

Garmit Pant 2024-8-5

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Hello Wang Ryan

Given that the double arrays created in the cells have different sizes, you need to resize these arrays so that they all have the same dimensions before you can add them together.

The following code snippet will help you resize the arrays in the cells and then sum them:

% Initialize the resulting matrices 
result_r = zeros(3264, 4911); 
result_g = zeros(3264, 4911); 
result_b = zeros(3264, 4911); 
% Loop through each cell and merge them 
for i = 1:30 
    % Get the current matrices 
    current_r = dr{i}; 
    current_g = dg{i}; 
    current_b = db{i}; 
    
    % Determine the size of the current matrices 
    [rows, cols] = size(current_r); 
    
    % Trim or pad the matrices to ensure they are 3264x4911 
    if cols > 4911 
        current_r = current_r(:, 1:4911); 
        current_g = current_g(:, 1:4911); 
        current_b = current_b(:, 1:4911); 
    elseif cols < 4911 
        current_r(:, end+1:4911) = 0; % Pad with zeros 
        current_g(:, end+1:4911) = 0; % Pad with zeros 
        current_b(:, end+1:4911) = 0; % Pad with zeros 
    end 
    
    % Add the current matrices to the result 
    result_r = result_r + current_r; 
    result_g = result_g + current_g; 
    result_b = result_b + current_b; 
end 