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Complex number math problems

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I am new to MATLAB and could really use help writing code to convert these
Given the following complex numbers:
Z1 = 3.5 + j 5.5
Z2 = 3.71 angle( pi / 4 )
Z3 = 0.125 angle( -5*pi / 2 )
Z4 = 9 exp( - j * 45 degrees )
Find the following:
  • Addition
  • Subtraction
  • Division
  • Conjugates
Walter Roberson
Walter Roberson on 4 Sep 2019
Addition and subtraction and division between what and what?

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Accepted Answer

Nicolas B.
Nicolas B. on 4 Sep 2019
Complex numbers work literally like all other numbers in MATLAB. The only interesting things are how you create them:
z1 = 1 + 3i; % first solution
z2 = 2 + 4j; % second solution (for engineers)
z3 = 3 * exp(pi/2*i); % solution amplitude and angle
Once you have complex numbers, you can multiply, add... with double-type data without any problem. If you want to extract the real or complex part, just real() or imag() functions.
Dalton Houghton-Schaffer
Dalton Houghton-Schaffer on 4 Sep 2019
Thank you so much! How can I do a conjugate in MATLAB?

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