*** empty log message ***

Plugin/Evaluate.cpp

@@ -155,7 +155,12 @@ PView *GMSH_EvaluatePlugin::execute(PView *v)
     externalTimeStep = 0;
   }
 
-  v1->setChanged(true);
+#if defined(HAVE_MATH_EVAL)
+  void *f = evaluator_create((char*)expr);
+  if(!f){
+    Msg::Error("Invalid expression '%s'", expr);
+    return v;
+  }
 
   OctreePost *octree = 0;
   if((data1->getNumEntities() != data2->getNumEntities()) ||
@@ -164,12 +169,7 @@ PView *GMSH_EvaluatePlugin::execute(PView *v)
     octree = new OctreePost(v2);
   }
 
-#if defined(HAVE_MATH_EVAL)
-  void *f = evaluator_create((char*)expr);
-  if(!f){
-    Msg::Error("Invalid expression '%s'", expr);
-    return v;
-  }
+  v1->setChanged(true);
 
   for(int step = 0; step < data1->getNumTimeSteps(); step++){
     if(timeStep >= 0 && timeStep != step) continue;
@@ -228,12 +228,11 @@ PView *GMSH_EvaluatePlugin::execute(PView *v)
     }
   }
   evaluator_destroy(f);
+  if(octree) delete octree;
 #else
   Msg::Error("MathEval is not compiled in this version of Gmsh");
 #endif
 
-  if(octree) delete octree;
-
   data1->finalize();
 
   return v1;

Plugin/Plugin.cpp

@@ -29,7 +29,7 @@ PViewDataList *GMSH_PostPlugin::getDataList(PView *view)
   }
   else{
     // FIXME: do automatic data conversion here
-    Msg::Error("This plugin can only be run on list-based datasets");
+    Msg::Error("This plugin can only be run on list-based views (`.pos' files)");
     return 0;
   }
 }