How to make one matrix?

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Ahmed 2024-1-28

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评论： Walter Roberson 2024-1-29

I have 100 arrays i.e. each have one row and diffrent columns (say size is A = 1 * 167 and B = 1 * 189 and so on). I want to make one matrix in way that the first row is A, second row is B and so on... But the columns will remain different. How can I do it?

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Ahmed 2024-1-29

@Torsten No this is not working e.g.,

ITER = [iters_1; iters_2];

Error using vertcat

Dimensions of arrays being concatenated are not consistent.

Error in PLOTTING_UNCERTINITY (line 172)

ITER = [iters_1; iters_2];

Stephen23 2024-1-29

"How can I do it?"

https://www.mathworks.com/matlabcentral/fileexchange/22909-padcat

https://www.mathworks.com/matlabcentral/answers/1656435-tutorial-comma-separated-lists-and-how-to-use-them

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采纳的回答

Torsten 2024-1-28

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https://ww2.mathworks.cn/matlabcentral/answers/2075401-how-to-make-one-matrix#answer_1398711

移动：Torsten 2024-1-28

在 MATLAB Online 中打开

Either use a cell array or dimension the matrix to have the maximum number of columns of the 100 row vectors:

A = [1 23 45];
B = [1 2];
M1 = cell(2,1);
M1{1} = A;
M1{2} = B;
M1
M1 = 2×1 cell array
    {[1 23 45]}
    {[    1 2]}
n = max(size(A,2),size(B,2));
M2 = zeros(2,n);
M2(1,:) = [A,zeros(1,n-size(A,2))];
M2(2,:) = [B,zeros(1,n-size(B,2))];
M2
M2 = 2×3
     1    23    45
     1     2     0

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Stephen23 2024-1-29

编辑：Stephen23 2024-1-29

"How to get rid off these zeros during plotting?"

Replace ZEROS with NAN. Or use the approach I gave you here:

https://www.mathworks.com/matlabcentral/answers/2075401-how-to-make-one-matrix#comment_3045381

"actually all the variables are stored separetly."

Having lots of separate variables makes your data much harder to work with.

It is much better to use a cell array or structure array.

Walter Roberson 2024-1-29

Whatever process is loading all that data into seperate variables: it would be better if it loaded it all into a cell or a struct array to start with.

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