AForge.Fuzzy.PiecewiseLinearFunction.GetMembership C# (CSharp) Méthode

GetMembership() public méthode

Calculate membership of a given value to the piecewise function.
Points of the membership function are not initialized.
public GetMembership ( float x ) : float
x float Value which membership will to be calculated.
Résultat float
        public float GetMembership( float x )
        {
            // no values belong to the fuzzy set, if there are no points in the piecewise function
            if ( points.Length == 0 )
                return 0.0f;

            // if X value is less than the first point, so first point's Y will be returned as membership
            if ( x < points[0].X )
                return points[0].Y;

            // looking for the line that contais the X value
            for ( int i = 1, n = points.Length; i < n; i++ )
            {
                // the line with X value starts in points[i-1].X and ends at points[i].X
                if ( x < points[i].X )
                {
                    // points to calculate line's equation
                    float y1 = points[i].Y;
                    float y0 = points[i - 1].Y;
                    float x1 = points[i].X;
                    float x0 = points[i - 1].X;
                    // angular coefficient
                    float m = ( y1 - y0 ) / ( x1 - x0 );
                    // returning the membership - the Y value for this X
                    return m * ( x - x0 ) + y0;
                }
            }

            // X value is more than last point, so last point Y will be returned as membership
            return points[points.Length - 1].Y;
        }
    }