+ void filterSignal (const double input[], double output[], double dx, const int n) const;
+ void filterSignal (const float input[], double output[], double dx, const int n) const;
+
+ static void finiteFourierTransform (const double input[], complex<double> output[], const int n, const int direction);
+
+ void finiteFourierTransform (const double input[], complex<double> output[], const int direction) const;
+