Added differentiation rule for start values

OpenModelica · Sep 26, 2015 · c5706c4 · c5706c4
1 parent 6b5d3a2
commit c5706c4
Showing 1 changed file with 4 additions and 0 deletions.
diff --git a/Compiler/BackEnd/Differentiate.mo b/Compiler/BackEnd/Differentiate.mo
@@ -558,6 +558,10 @@ algorithm
       //print("\nresults to exp: " + se1);
     then (res, functionTree);
 
+    // differentiate start value
+    case DAE.CALL(path=Absyn.IDENT(name="$_start"), attr=DAE.CALL_ATTR(ty=tp))
+    then (Expression.makeConstZero(tp), inFunctionTree);
+
     // differentiate homotopy
     // lochel: see #3305 - this is commented out since it breaks Modelica.Fluid.Examples.HeatingSystem.
     //case DAE.CALL(path=Absyn.IDENT(name="homotopy"), expLst=actual::_) equation