r in matlab in matlab

The command r in MATLAB is not a standard MATLAB command. Therefore, it will produce an error message. If you want to use the variable r, you can define it as follows:

main.m
r = 10; % Define r as a scalar with value 10
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If you want to create a vector or a matrix, you can also use r as a variable name:

main.m
r = [1 2 3 4]; % Define r as a row vector
r = [1; 2; 3; 4]; % Define r as a column vector
r = [1 2; 3 4]; % Define r as a 2x2 matrix
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However, you should avoid using variable names that conflict with MATLAB commands or built-in functions.