Is there a function similar to numpy unique with inverse?

[stevengj]

See also:

• Unique (indices) method similar to MATLAB
• indices of unique elements of vector in Julia - Stack Overflow
• https://groups.google.com/g/julia-users/c/205gVuPuZFU?pli=1
• https://github.com/JuliaLang/julia/issues/1845

And in particular this solution:

uniqueinds(x) = unique(i -> x[i], eachindex(x))

However, this isn’t quite the same thing: it’s equivalent to return_index=True in numpy.unique, not return_inverse=True.