Hello, folks. Sorry for not posting anything for a long time, just busy with my university studies for the moment.
Quick script for today — Smooth Step.
You can search for it in Wikipedia, but saying shortly and informatively, this is just an advanced type of oscillator, used as momentum indicator.
In the codes across the Internet everybody uses the 3rd order...
Functions with parameters do not work correctly: the returned value is sometimes different from the expected one.
The example script works correctly only when idx = 1 (instead of the current line 6).