Accord.Fuzzy.LinguisticVariable.AddLabel C# (CSharp) Method

        public void AddLabel( FuzzySet label )
        {
            // checking for existing name
            if ( this.labels.ContainsKey( label.Name ) )
                throw new ArgumentException( "The linguistic label name already exists in the linguistic variable." );

            // checking ranges
            if ( label.LeftLimit < this.start )
                throw new ArgumentException( "The left limit of the fuzzy set can not be lower than the linguistic variable's starting point." );
            if ( label.RightLimit > this.end )
                throw new ArgumentException( "The right limit of the fuzzy set can not be greater than the linguistic variable's ending point." );

            // adding label
            this.labels.Add( label.Name, label );
        }

        // Testing basic functionality of linguistic variables
        private void runLingVarTestButton_Click(object sender, EventArgs e)
        {
            ClearDataSeries();

            // create a linguistic variable to represent temperature
            LinguisticVariable lvTemperature = new LinguisticVariable("Temperature", 0, 80);

            // create the linguistic labels (fuzzy sets) that compose the temperature 
            FuzzySet fsCold = new FuzzySet("Cold", new TrapezoidalFunction(10, 15, TrapezoidalFunction.EdgeType.Right));
            FuzzySet fsCool = new FuzzySet("Cool", new TrapezoidalFunction(10, 15, 20, 25));
            FuzzySet fsWarm = new FuzzySet("Warm", new TrapezoidalFunction(20, 25, 30, 35));
            FuzzySet fsHot = new FuzzySet("Hot", new TrapezoidalFunction(30, 35, TrapezoidalFunction.EdgeType.Left));

            // adding labels to the variable
            lvTemperature.AddLabel(fsCold);
            lvTemperature.AddLabel(fsCool);
            lvTemperature.AddLabel(fsWarm);
            lvTemperature.AddLabel(fsHot);

            // get membership of some points to the cool fuzzy set
            double[][,] chartValues = new double[4][,];
            for (int i = 0; i < 4; i++)
                chartValues[i] = new double[160, 2];

            // showing the shape of the linguistic variable - the shape of its labels memberships from start to end
            int j = 0;
            for (float x = 0; x < 80; x += 0.5f, j++)
            {
                double y1 = lvTemperature.GetLabelMembership("Cold", x);
                double y2 = lvTemperature.GetLabelMembership("Cool", x);
                double y3 = lvTemperature.GetLabelMembership("Warm", x);
                double y4 = lvTemperature.GetLabelMembership("Hot", x);

                chartValues[0][j, 0] = x;
                chartValues[0][j, 1] = y1;
                chartValues[1][j, 0] = x;
                chartValues[1][j, 1] = y2;
                chartValues[2][j, 0] = x;
                chartValues[2][j, 1] = y3;
                chartValues[3][j, 0] = x;
                chartValues[3][j, 1] = y4;
            }

            // plot membership to a chart
            chart.UpdateDataSeries("COLD", chartValues[0]);
            chart.UpdateDataSeries("COOL", chartValues[1]);
            chart.UpdateDataSeries("WARM", chartValues[2]);
            chart.UpdateDataSeries("HOT", chartValues[3]);
        }