Change for cross function from R2019a to R2019b

조회 수: 2 (최근 30일)
Manwë
Manwë 2019년 11월 18일
댓글: Tony Avito 2020년 2월 14일
I see that to perform the calculation done by R2019a's cross function I now have to do conj(cross). I see that https://www.mathworks.com/help/matlab/ref/cross.html has been updated, but where else is this notable change documented ?
  댓글 수: 2
James Tursa
James Tursa 2019년 11월 18일
편집: James Tursa 2019년 11월 18일
Interesting change, although I have never had the need to take the cross product of complex vectors myself.
Manwë
Manwë 2019년 11월 18일
편집: Manwë 2019년 11월 18일
For instance, in the time harmonic formulation (using complex numbers and replacing E with E*e^{i w t}) of Maxwell equations in a 3d domain, the boundary conditions (Dirichlet or Neumann) are formulated with a cross product.

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답변 (1개)

Steven Lord
Steven Lord 2019년 12월 19일
  댓글 수: 1
Tony Avito
Tony Avito 2020년 2월 14일
The update 4 is still returning the complex conjugate :)
Incorrect Code Generation: cross returns complex conjugated results for complex inputs (2088279)
try to run the code as they say:
>> a = magic(3) + 1i.*magic(3);
>> b = ones(3) + 1i.*ones(3);
>> c = cross(a,b)
c =
0.0000 - 2.0000i 0.0000 - 8.0000i 0.0000 +10.0000i
0.0000 - 8.0000i 0.0000 +16.0000i 0.0000 - 8.0000i
0.0000 +10.0000i 0.0000 - 8.0000i 0.0000 - 2.0000i

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