Create variables name with iteration number in each time step?

k =0;
for Timestep = 1:3
    for k = 1:5
        DN(1,k) = k
    end
    % here I want to make variable names DN_1, DN_2, DN_3, DN_4 and DN_5 with different Timestep so, DN_1(Timestep), ..., DN_5(Timestep).
    % DN_1(Timestep) = DN(1,1);
    % DN_2(Timestep) = DN(1,2);
    % DN_3(Timestep) = DN(1,3);
    % DN_4(Timestep) = DN(1,4);
    % DN_5(Timestep) = DN(1,5);
end
% I can generate DN_1, .., DN_5 with genvarname but I cannot make them as arrays. 
% Thanks in advance if you have any good idea.

[Stephen23]

https://www.mathworks.com/matlabcentral/answers/304528-tutorial-why-variables-should-not-be-named-dynamically-eval

[BYUNGTARK LEE]

Thanks for the comment. But I am using this variables just for recording purpose. I am not using these variables in calculations.

[Stephen23]

"But I am using this variables just for recording purpose. I am not using these variables in calculations."

It makes no difference what you are using data for, the simple and effiicient approach is to use indexing into one array.

[BYUNGTARK LEE]

I understand that it is better to avoid this, but I need a solution.

Answer 1

[Walter Roberson]

Please read http://www.mathworks.com/matlabcentral/answers/304528-tutorial-why-variables-should-not-be-named-dynamically-eval for information about why we strongly recommend against creating variable names dynamically.

[BYUNGTARK LEE]

Thanks for the comment. But I am using this variables just for recording purpose. I am not using these variables in calculations.

[Walter Roberson]

If you are "recording" as text display, then you can construct the text display with an appropriate character vector instead of needing it to be the name of a variable.

If you are "recording" by saving the variables to a file, then you can use dynamic structure field names and save() with the -struct option.

for k = 1:5
    DNs.("DN_" + k) = k;
end
save(FILENAME, '-struct', 'DNs');

[BYUNGTARK LEE]

But DN_1 is not the variable I want. I need to define array DN_1(Timestep) ~ DN_5(Timestep). I want to record DN_1 ~ DN_5 in each timestep.

[Walter Roberson]

For the sake of discussion, write code as if you could access variable names using a syntax such as

DN_<k>(timestep) = value

with the <k> intended to show a dynamic variable name .

This syntax does not exist in MATLAB, but if you were to write demonstration code for us showing us exactly which dynamic variable names you want to use and where, then one of the volunteers can show you how to convert that into MATLAB code.