How to apply a bound constraint on a complex power vector

Question

Saifullah Khalid 2019-10-13

0
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https://ww2.mathworks.cn/matlabcentral/answers/484986-how-to-apply-a-bound-constraint-on-a-complex-power-vector

编辑： Thiago Henrique Gomes Lobato 2019-10-14

采纳的回答： Thiago Henrique Gomes Lobato

I am trying to optimize a complex power vector

with

where

and

is a complex number greater than 0. I have implemented bound constraints as

. But, after the optimization is complete, the Pareto front contains vector like (

) . I can not make sense out them as power vector , to me, should not be a negative value especially the real part. Am I missing something? I would appreciate any helpful advice, comment or hint.

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Answer 1

Thiago Henrique Gomes Lobato 2019-10-13

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https://ww2.mathworks.cn/matlabcentral/answers/484986-how-to-apply-a-bound-constraint-on-a-complex-power-vector#answer_396103

编辑：Thiago Henrique Gomes Lobato 2019-10-14

在 MATLAB Online 中打开

Saying that a complex number is bigger than the other is not so simple, you're comparing the magnitue? The real part? The imaginary part? It actually can't be done in a standardized way for all cases and thus matlab uses what I believe to be the most used one, which is to compare the magnitude. Therefore when you compare max(S,0), S will always be greater, because it magnitude will be greater then 0 for all values that aren't zero. You can solve that problem by comparing the real and imaginary part by separately:

s = -0.0456-1j*0.3456;
Tmax = 10+1j*10;
Tmin= 0;
% Complex comparison (Magnitude is compared)
ComplexCompariosn = min(max(Tmin,s),Tmax)
% Individual Comparison
IndividualComparison = min(max(real(Tmin),real(s)),real(Tmax)) +...
                       1j*min(max(imag(Tmin),imag(s)),imag(Tmax))
ComplexCompariosn =
  -0.0456 - 0.3456i
IndividualComparison =
     0