1. The problem statement, all variables and given/known data Hi, I want to calculate the relative error between two complex numbers. Lets say z'=a' + i b' is an approximation of z = a + i b. 2. Relevant equations How can I calculate the relative error between two complex numbers z' and z? 3. The attempt at a solution Calculating the relative error of z' and z (if they were real) is done like: error = │(z' - z) / z │ Is it the same for complex numbers?