Constructor for Axis

[baggepinnen]

I'm struggling to figure out how to properly create an Axis

From a vector of symbols, state_names, I want to create an axis that can be used for the variable x and the matrix A in

x' = A*x

I guess it would be possible to have a slurping constructor that accepts something like the following

julia>     ax_x = Axis(state_names...)
FlatAxis()

and internally dispatches to the NamedTuple so I do not have to figure out this awkward way of constructing such an Axis.

julia> ax_x = Axis((; (state_names .=> (1:sys.nx))...))
Axis(x1 = 1,)

Indeed, if I define

function ComponentArrays.Axis(names::Symbol...)
    Axis((; (names .=> (1:length(names)))...))
end

julia>     ax_x = Axis(state_names...)
Axis(x1 = 1,)

I seem to get what I want :)

[jonniedie]

I guess for the case where each name corresponds to a scalar element, that makes sense. But most use cases for ComponentArrays are a little more complicated than that, so I've never really thought to define a convenience constructor for this case. Actually, it's been a while since I've given any thought to Axis constructors, since I generally don't use them (I usually create a prototype of a ComponentVector and use getaxes).