The idea is to characterize recent curve shape (momentum) with numbers.
A positive curve value combined with positive Slope Calculation ought to mean a new local low (for now).
Not perfect. Maybe others can add to this. Lookback window plays a huge role. Comments in the code.
Positive value: Sort of bowl-shaped.
Negative value: Sort of hat-shaped.
What you call "bowl-shaped" and "hat-shaped" is called "convex" and "concave", respectively. This is independent of the sign of the slope (first derivative).
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