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FUNCTION_BLOCK Cubic-Approximator
VAR_INPUT
X: REAL;
END_VAR
VAR_OUTPUT
ApproxXCubed: REAL;
END_VAR
FUZZIFY X
RANGE := (-5.000 .. 5.000);
TERM AboutNegFive := Triangle -6.000 -5.000 -4.000;
TERM AboutNegFour := Triangle -5.000 -4.000 -3.000;
TERM AboutNegThree := Triangle -4.000 -3.000 -2.000;
TERM AboutNegTwo := Triangle -3.000 -2.000 -1.000;
TERM AboutNegOne := Triangle -2.000 -1.000 0.000;
TERM AboutZero := Triangle -1.000 0.000 1.000;
TERM AboutOne := Triangle 0.000 1.000 2.000;
TERM AboutTwo := Triangle 1.000 2.000 3.000;
TERM AboutThree := Triangle 2.000 3.000 4.000;
TERM AboutFour := Triangle 3.000 4.000 5.000;
TERM AboutFive := Triangle 4.000 5.000 6.000;
END_FUZZIFY
DEFUZZIFY ApproxXCubed
RANGE := (-5.000 .. 5.000);
TERM TangentatNegFive := Linear 75.000 250.000;
TERM TangentatNegFour := Linear 48.000 128.000;
TERM TangentatNegThree := Linear 27.000 54.000;
TERM TangentatNegTwo := Linear 12.000 16.000;
TERM TangentatNegOne := Linear 3.000 2.000;
TERM TangentatZero := Linear 0.000 0.000;
TERM TangentatOne := Linear 3.000 -2.000;
TERM TangentatTwo := Linear 12.000 -16.000;
TERM TangentatThree := Linear 27.000 -54.000;
TERM TangentatFour := Linear 48.000 -128.000;
TERM TangentatFive := Linear 75.000 -250.000;
METHOD : COGS;
DEFAULT := nan;
END_DEFUZZIFY
RULEBLOCK
RULE 1 : if X is AboutNegFive then ApproxXCubed is TangentatNegFive
RULE 2 : if X is AboutNegFour then ApproxXCubed is TangentatNegFour
RULE 3 : if X is AboutNegThree then ApproxXCubed is TangentatNegThree
RULE 4 : if X is AboutNegTwo then ApproxXCubed is TangentatNegTwo
RULE 5 : if X is AboutNegOne then ApproxXCubed is TangentatNegOne
RULE 6 : if X is AboutZero then ApproxXCubed is TangentatZero
RULE 7 : if X is AboutOne then ApproxXCubed is TangentatOne
RULE 8 : if X is AboutTwo then ApproxXCubed is TangentatTwo
RULE 9 : if X is AboutThree then ApproxXCubed is TangentatThree
RULE 10 : if X is AboutFour then ApproxXCubed is TangentatFour
RULE 11 : if X is AboutFive then ApproxXCubed is TangentatFive
END_RULEBLOCK
END_FUNCTION_BLOCK
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