Creating a function with utf

[janrpeters]

Is there a way how I can replace

inv(x)

by

x⁻¹

or

(x)⁻¹

instead? I would like to define a new postfix operator!

[Sevi]

I think there is a way, but I’m not sure it’s really feasible.

One example of what you describe is the adjoint function and the ' postfix operator
https://docs.julialang.org/en/v1/stdlib/LinearAlgebra/#Base.adjoint

Based on this post, the infix/postfix/… operators are detected in the parser. Looks like trans-op/ctrans-op refers to the adjoint mentioned above.

So, in principle, one could add more individual rules to parse the code and recognize postfix operators, but since x⁻¹ is otherwise just a normal variable name, I don’t think there is a way without hacking the parser…

[Sevi]

I stand corrected, seems like you found the solution (I’ll link it here just for future reference):

Using superscript ⁻¹ as a postfix operator for inv?

You can actually do this with no language changes if you’re willing to write (A)⁻¹ rather than A⁻¹. Here’s an example at the REPL: julia> begin struct Inverter end const ⁻¹ = Inverter() Base.:(*)(A, ::Inverter) = inv(A) end julia> A = rand(3,3) 3×3 Array{Float64,2}: 0.51549 0.0616877 0.530502 0.783366 0.0598045 0.697045 0.381722 0.833891 0.632847 julia> (A)⁻¹ 3×3 Array{Float64,2}: -13.5368 10.0475 0.280811 -5.72129 3.08199 1.401…

A pretty neat example of what weird but cool things are possible