How to Concatenate 5 differently named variables in one variable using foor loop?

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Raza Ali 2022-1-12

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1627230-how-to-concatenate-5-differently-named-variables-in-one-variable-using-foor-loop

编辑： Stephen23 2022-1-12

A_1=1;

A_2=2;

A_3=3;

A_4=4;

A_5=5;

for i=1:5

% now here i want to concatinate A_1 to A_5

end

Combine= [1 2 3 4 5] % this is required

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Raza Ali 2022-1-12

Thank you for the comments. Actually, I have n variables and every variable has a different number of elements (a row matrix). So, I need to combine all the elements of all n variables.

Stephen23 2022-1-12

编辑：Stephen23 2022-1-12

在 MATLAB Online 中打开

"Actually, I have n variables and every variable has a different number of elements (a row matrix). So, I need to combine all the elements of all n variables."

That is very easy if you have well-designed data, e.g. multiple vectors in one cell array C, using any of these:

V = [C{:}]
V = cat(n,C{:})
V = horzcat(C{:})
V = vertcat(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

Trying to do that with badly-designed data (e.g. lots of variables with numbered names) will be much more complex and inefficient than that simple code. Better data design -> much better code.

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回答（1 个）

VIGNESH B S 2022-1-12

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1627230-how-to-concatenate-5-differently-named-variables-in-one-variable-using-foor-loop#answer_873045

在 MATLAB Online 中打开

a1 = 5;
a2 = 10;
a3 = 15;
combined_row_wise = [a1,a2,a3]
combined_row_wise = 1×3
     5    10    15
combined_column_wise = [a1;a2;a3]
combined_column_wise = 3×1
     5
    10
    15