MQL5 ReferenceStandard LibraryMathematicsFuzzy LogicMembership functionsCTrapezoidMembershipFunctionGetValue X1X2X3X4GetValue GetValue Calculates the value of the membership function by a specified argument. double GetValue( const x // membership function argument ) Parameters x [in] Membership function argument. Return Value Membership function value. X4 CTriangularMembershipFunction