ASMT output, MBDyn input and output done.

OndselSolver/ExpressionX.cpp

@@ -7,6 +7,7 @@
  ***************************************************************************/
  
 #include "ExpressionX.h"
+#include "Constant.h"
 
 using namespace MbD;
 
@@ -23,8 +24,14 @@ void MbD::ExpressionX::xexpression(Symsptr arg, Symsptr func)
 	expression = func;
 }
 
+Symsptr MbD::ExpressionX::differentiateWRTx()
+{
+	return expression->differentiateWRT(xx);
+}
+
 Symsptr MbD::ExpressionX::differentiateWRT(Symsptr var)
 {
+	if (this == var.get()) return sptrConstant(1.0);
 	return expression->differentiateWRT(var);
 }