MQL5 ReferenceStandard LibraryMathematicsFuzzy LogicMembership functionsCTrapezoidMembershipFunctionX1 X1X2X3X4GetValue X1 (Get method) Gets the value of the first point on the X axis. double X1() Return Value The value of the first point on the X axis. X1 (Set method) Sets the value of the first point on the X axis. void X1( const double x1 // value of the first point on the X axis ) Parameters x1 [in] The value of the first point on the X axis. CTrapezoidMembershipFunction X2