- `ZC = conj (Z)`

Return the complex conjugate of `Z`.

The complex conjugate is defined as `%conj (Z)' = X - IY%`.

See also: `real`, `imag`.

### References

- https://www.mathworks.com/help/matlab/ref/conj.html
- https://octave.sourceforge.io/octave/function/conj.html
- https://mathworld.wolfram.com/ComplexConjugate.html
- https://en.wikipedia.org/wiki/Complex_conjugate