Problems with creating a dynamic struct with num2str

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for i = 1:9
M.[num2str(i)] = zeros(3,3);
end
This gives me error, I have never really understood the syntaxis of num2str or how to use it with combination of text. This has probably a really simple answer but I havent been able to find it. Thanks for your time.

Accepted Answer

Ive J
Ive J on 3 Jan 2021
First of all you cannot choose a digit as filed name due to the same reason you cannot choose it as a variable name.
for i = 1:9
M.(['x', num2str(i)]) = zeros(3,3);
end
Or if you prefer strings:
for i = 1:9
M.("x" + i) = zeros(3,3);
end

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