real and imaginary part of function in matlab

In MATLAB, we can decompose a complex number into its real and imaginary parts using the real and imag functions. Both functions are applied to a complex number as shown below:

main.m
z = 3 + 2i;  % An example complex number
real_part = real(z);  % Extracting the real part
imag_part = imag(z);  % Extracting the imaginary part
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The variables real_part and imag_part will then be assigned the values 3 and 2, respectively.

If you have a function that returns a complex number, you can apply the above logic to extract its real and imaginary parts as follows:

main.m
function [real_part, imag_part] = my_function(input_arg)
    % Function implementation that returns a complex number
    z = ...;  
    
    % Extracting the real and imaginary parts
    real_part = real(z);
    imag_part = imag(z);
end
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In this example, the function my_function takes an input argument and returns a complex number z, and also returns its real and imaginary parts as real_part and imag_part.

Note that the real and imaginary parts of a complex number are also commonly referred to as its "resistance" and "reactance", respectively, in electrical engineering contexts.