Not in Julia (yet, I’ll see about adding it to Grassmann.jl), but would something like this work ?
You can easily change the function there, and it will handle any number of arguments.
(update: made it interactive, you can drag the point in 5 dimensions, it gets projected on each of the five axi sticking out of p to find the coefficient for that dimension.).
(removed old image here - I’m only allowed to post 1)
(edit: I just realized you want slightly different behavior - dragging p to move the cross and project onto the x-axis of each of the graphs for the coordinate in that dimension - I’ll have a go at that in a bit)
Update … I believe the current version (same link) is more what you had in mind. Pretty fun way of displaying high-d scalar fields !