Analytic time derivative of PerformanceCurve. Mirrors TRANSFORM.Math.PerformanceCurve_der.
function PerformanceCurve_der extends TRANSFORM.Icons.Function; input Real x; input Real x_curve[:]; input Real y_curve[size(x_curve, 1)]; input Real d[size(x_curve, 1)]; input Real r_N(unit = "1"); input Real delta; input Real x_der; input Real r_N_der; output Real y_der; end PerformanceCurve_der;