How can i create variables from a string?

Hi! I want to create an array of variables m1,m2,m3,....,mn, that are created by join "m" with array "1,2,3,...,n" I wrote a code (below), and i want to after run it, Matlab returns: m1=1 m2=5

M=[1 2 3;
    4 5 6;
    7 8 9];
mch=diag(M,0)';
x=2;
for i=1:x
    ha=num2str(i);
    m(ha)= mch(i);
end

Thank you so much!

[Stephen23]

@Le Dung: this will make your code slow, buggy, hard to debug, hard to read, and obfuscated.

https://www.mathworks.com/help/matlab/matlab_prog/string-evaluation.html

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

Answer 1

[KSSV]

Why you need a dynamic variable naming? This is not suggested and you should avoid.

https://in.mathworks.com/matlabcentral/answers/105936-how-to-make-dynamic-variable-names-a1-a2-an-with-for-loop-using-eval-num2str

You have matrix already and you can happily call them:

M=[1 2 3;
    4 5 6;
    7 8 9];
M(1)    % is M1
M(2)    % is M2
M(6)    % is M6
.
.
.M(i)   % is Mi where  i <= numel(M)

[Le Dung]

Yes, It's very kind of you. But, because i want to make a general problem. Thank you so much. I wrote a code as (below), why matlab returns results that i don't want. Detail, I received a variable "eval" that has size is (1x77) and, only end value of eval is equal to 5. Why?, I want to m1 = 1, m2 = 5

M=[1 2 3;
    4 5 6;
    7 8 9];
mch=diag(M,0)';
x=2;
for i=1:x
    eval(['M' num2str(i)'])=mch(i);
end

[Stephen23]

"But, because i want to make a general problem"

Yes, you are trying to make a general problem. And KSSV gave you a general solution instead.

Good work, KSSV.

M = [1,2,3;4,5,6;7,8,9];
mch = diag(M,0); % this is all you need

[Sami Aldalahmeh]

I believe that you should answer the question if you can not discourage the user. Giving advice in a polite way, on the other hand, is always welcomed.