how to append matrices of different sizes together

Question

jaah navi 2020-3-10

0
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https://ww2.mathworks.cn/matlabcentral/answers/510035-how-to-append-matrices-of-different-sizes-together

编辑： Ameer Hamza 2020-3-10

I am having three different matrices as

A = [1 2; 3 4]
B = [4 5 6; 7 8 9]
C=[10 11 12 13; 14 15 16 17]

i want to have the result in the following manner

D=[ 1 2;
4;
5 6;
8 9;
11 12 13;
15 16 17]

could anyone please help me on it.

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Ajay Kumar 2020-3-10

Does appending 0's or NaN's work?

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Answer 1

Ameer Hamza 2020-3-10

0
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https://ww2.mathworks.cn/matlabcentral/answers/510035-how-to-append-matrices-of-different-sizes-together#answer_419396

编辑：Ameer Hamza 2020-3-10

在 MATLAB Online 中打开

In MATLAB, all the rows and columns of the matrix must be of equal length. If you just want to combine them in one variable, I suitable way is to use cell Array;

A = [1 2; 3 4]
B = [4 5 6; 7 8 9]
C= [10 11 12 13; 14 15 16 17]
D = {A,B,C}

The other option is to replace the absent entries with NaN

A = [1 2; 3 4];
B = [4 5 6; 7 8 9];
C = [10 11 12 13; 14 15 16 17];
D = {A,B,C};
mat_sizes = cellfun(@(x) size(x), D, 'UniformOutput', 0)';
max_dims = max(cell2mat(mat_sizes), [], 1);
result = cellfun(@(x,y) ...
    padarray(x, [0, max_dims(2)-size(x,2)], 'post'), ...
    D', mat_sizes, 'UniformOutput', 0);
result = cell2mat(result);