EE341: MATLAB EXAMPLE DEMONSTRATING M-FILE USE AND COMPLEX NUMBER OPERATIONS

This example shows how to use a m-file to perform some complex number operations in matlab. The m-file can be created in any text editor (e.g., emacs or notepad).

MATLAB M-File example3.m: 
% Filename: example3.m
%
% Description: M-file for demonstration of complex number operations.
%

clear;                          % clear matlab memory
z = -2 - j*3;                   % define complex number z=-2-j3
abs(z)                          % compute magnitude of complex number
angle(z)                        % compute angle (in radians) of complex number
angle(z)*180/pi                 % compute angle (in degrees) of complex number

[anglez, magz] = cart2pol(real(z), imag(z))  % recompute magnitude and phase
                                             % of complex number
                                             
y = 3*exp(-j*pi/4)		% define complex number y=3e^(-jpi/4)

[realy, imagy] = pol2cart(-pi/4, 3)  % determine real and imaginary parts of a
                                     % complex number 3e^(-jpi/4)
                                    
y*z				     % multiply complex numbers
Before running the m-file, make sure matlab looks in the directory where the m-file is stored (C:\Temp in my case) by using the change directory (cd) command: 
>> cd C:\Temp
Run example3.m by typing example3 at the prompt: 
>>example3
Results shown in the matlab command window: 
ans =

    3.6056


ans =

   -2.1588


ans =

 -123.6901


anglez =

   -2.1588


magz =

    3.6056


y =

   2.1213 - 2.1213i


realy =

    2.1213


imagy =

   -2.1213


ans =

 -10.6066 - 2.1213i