Examples of PiFunction

fuzzy4j.sets.PiFunction
Pi apply function. Called Pi function because it's shape looks like Pi (uppercase).
```
 {@code yA 1-|          .-------. |         /    :    \ |       _/     :     \_ |     _/       :       \_ -0-+----'---------:---------'------> x |   a     p    r    q     b}
```
[1] Saroj K. Meher, "A new Fuzzy Supervised Classification Method based on Aggregation Operator", in 3rd Int. IEEE Conf. on Signal-Image Tech. and Internet-Based Systems, 2008. @author Soren A. Davidsen

Examples of fuzzy4j.sets.PiFunction

        assertTrue(impl.set instanceof TrapezoidalFunction);
    }


    @Test
    public void testTerm() throws Exception {
        impl = Term.term("any", new PiFunction(0, 1, 3, 1));
        assertTrue(impl.set instanceof PiFunction);


        try {
            impl = Term.term(null, new PiFunction(0, 1, 3, 1));
            fail();
        }
        catch (IllegalArgumentException e) {}


        try {

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Examples of fuzzy4j.sets.PiFunction

    }


    public void pifunctionExample() {


        // this type of function should have only a single max value.
        set = new PiFunction(5, 10, 15, 1);


        double res1 = Maximum.meanOfMax().apply(var, set);


        double res2 = Maximum.minOfMax().apply(var, set);

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