expose SetCustomExcite() in Python (ported from PR #129)

openems.cpp

@@ -882,6 +882,12 @@ void openEMS::SetStepExcite(double f_max)
 	m_Exc->SetupStepExcite(f_max);
 }
 
+void openEMS::SetCustomExcite(std::string str, double f0, double fmax)
+{
+	this->InitExcitation();
+	m_Exc->SetupCustomExcite(str, f0, fmax);
+}
+
 Excitation* openEMS::InitExcitation()
 {
 	delete m_Exc;

openems.h

@@ -105,6 +105,7 @@ public:
 	void SetSinusExcite(double f0);
 	void SetDiracExcite(double f_max);
 	void SetStepExcite(double f_max);
+	void SetCustomExcite(std::string str, double f0, double fmax);
 
 	Excitation* InitExcitation();
 

python/openEMS/openEMS.pyx

@@ -259,6 +259,17 @@ cdef class openEMS:
         """
         self.thisptr.SetStepExcite(f_max)
 
+    def SetCustomExcite(self, _str, f0, fmax):
+        """ SetCustomExcite(_str, f0, fmax)
+
+        Set a custom function as excitation signal. The custom function is supplied as a string which gets
+        parsed using `Function Parser for C++ <http://warp.povusers.org/FunctionParser/fparser.html>`_.
+
+        :param _str: str -- Custom function as string literal
+        :param f0: -- Base frequency.
+        :param fmax: -- Maximum frequency.
+        """
+        self.thisptr.SetCustomExcite(_str, f0, fmax)
 
     def SetBoundaryCond(self, BC):
         """ SetBoundaryCond(BC)