Concatenate 3-D matrix in a for loop

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Joana 2021-5-6

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评论： Stephen23 2021-5-6

采纳的回答： Stephen23

Hi

I have 25 matrices of 3-D 150x66x1000. I need to concatenate them in a for loop to get an output of 3750x66x1000.

How can i do that.?

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Stephen23 2021-5-6

" I need to concatenate them in a for loop..."

Why do you need to use a FOR loop?

Using VERTCAT or CAT would be simpler and probably more efficient.

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Answer 1

Stephen23 2021-5-6

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编辑：Stephen23 2021-5-6

在 MATLAB Online 中打开

Where C is a cell array containing all of your arrays:

out = cat(1,C{:});

https://www.mathworks.com/help/matlab/matlab_prog/comma-separated-lists.html

https://www.mathworks.com/matlabcentral/answers/320713-how-to-operate-on-comma-separated-lists

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Answer 2

KSSV 2021-5-6

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A = rand(2,3,4) ; 
B = rand(2,3,4) ; 
C = cat(1,A,B)

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Joana 2021-5-6

Thanks for the comment. But can you please help me with the loop thing.?

KSSV 2021-5-6

You have 25 matrices ... how they are named? How the data is?

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Answer 3

Sambit Supriya Dash 2021-5-6

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With an example, I would like to answer this. Suppose, "a" is the given 3D Matrix

and "b" is the 2D matrix returns the concatenated "a"

a(:,:,1) = [1 2;3 4]; % a --> Given Tensor (3D Matrix) to be operated into matrix "b"
for i = 2:4
    a(:,:,i) = a(:,:,i-1)+1;  % Supposing elemental opeartion is incrementing element by 1
end
[x,y,z] = size(a); % Calculate the length of tensor in 3rd D
b = zeros(x,y*z);
for k = 1:z
    for i = 1:x
        for j = 1:y
            b(i,j+2*(k-1)) = a(i,j,k); % Concatenating 
        end
    end
end
% For Checking the Concatenation of 3D Elements
c = reshape(a,x,y*z);
if b == c
    disp('CONCATENATION SUCCESSFUL')
    disp(b)
else
    disp('CONCATENATION FAILED')
end