new syntax for transpose

[StefanKarpinski]

Now that .op is generally the vectorized form of op, it's very confusing that .' means transpose rather than the vectorized form of ' (adjoint, aka ctranspose). This issue is for discussing alternative syntaxes for transpose and/or adjoint.

[KristofferC]

[mbauman]

Yeah, looks like that on GitHub to me, too. But it's an overbar. Copy and paste into my terminal shows:

Too clever and cute. I still do like the combining characters, though, and I think 'ᵀ is nice.

[johnalx]

-100 to changing adjoint, since it's one of the awesome things that makes writing Julia code as clear as writing math, plus conjugate transpose is usually what you want anyway so it makes sense to have an abbreviated syntax for it.

There is a certain arrogance to a statement like this. Consider that some finite proportion of developers explicitly do not want adjoint() but need transpose().

Case and point for us working with symbolic calculations for modeling the default ' operator would cause for example the pseudo-inverse (A'*A)\(Ab) or a quadratic form `v'A*v` to return erroneously long and complex results that cannot be reduced.

Maybe the solution is some kind of compiler directive declaring the meaning of '.