Why piece-wise MF only accepts 3 points? (ABC)?

[scikit-fuzzy]

Why piece-wise MF only accepts 3 points? (ABC)?

[arruda]

With this definition all simple elements e.g. ramp and triangle can be defined. The points shall be
given in ascending order of variable value. The membership function is linear between successive
points. The degree of membership for each term is therefore calculated from the crisp input value by
the linear interpolation between the two relevant adjacent membership function points.
The number of points can vary, but its maximum number is restricted according to the clause 6
conformance classes.

Not sure what is thi clause 6 (or where to find it)... but there might be the answer to this limit.

[JDWarner]

The main issue here is misunderstanding, combined with what wasn't the best design on my part in the first place.

piecemf is a public function that actually only implements a very specific piecewise function, described in the docstring. Honestly, I probably should have made this a hidden function and stuffed it into filters for internal use with the FIRE functions only. It's not the right tool for what you're trying to do here.

[arruda]

👍

[arruda]

Hey, sorry to raise a dead issue, but I've come up with this function for the piece wise, and was thinking if it would be ok to put it next to the other MF's functions in here. Not sure if this would be considered a truly universal piecewise function (if necessary, I could change the name to a more specific one):
https://github.com/arruda/scikit_fuzzy_fcl/blob/704b9e83601444e5f0dde6c2e597108dfbf3e099/scikit_fuzzy_fcl/fcl_listener.py#L23-L55