Using @lift with @sprintf for animation in Makie.jl

General Usage
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2

More than one macro confuses Julia. What I have ended up doing is getting rid of one macro call and burying the other one.

Something like

function title_string(current_iter, current_J) 
    @sprintf "iteration : %.0f\ncost function : %.3e" current_iter current_J 
end

iter_idx = Observable(1)

text_itr = lift(t -> title_string(trace_J[t], t - 1), iter_idx) #Avoid the macro call here

text!(ax1, Point2f(0, 0), text=text_str, align=(:left, :top))

(You may need to adjust to make it run but that is the idea)