added new function to get the number of a physical entity from its name and dimension

getPhysicalNumber(const int &dim, const std::string & name)

Geo/GModel.cpp

@@ -312,6 +312,15 @@ std::string GModel::getPhysicalName(int dim, int number)
   return "";
 }
 
+int GModel::getPhysicalNumber(const int &dim, const std::string & name)
+{
+  for(piter physIt=firstPhysicalName();physIt !=lastPhysicalName();++physIt)
+	if(dim==physIt->first.first && name==physIt->second)
+	  return physIt->first.second;
+  Msg::Warning("No physical group found with the name :",name);
+  return -1;
+}
+
 void GModel::setSelection(int val)
 {
   std::vector<GEntity*> entities;

Geo/GModel.h

@@ -229,6 +229,10 @@ class GModel
   // "dim" and id number "num"
   std::string getPhysicalName(int dim, int num);
 
+  // get the number of a given physical group of dimension
+  // "dim" and name "name". return -1 if not found
+  int getPhysicalNumber(const int &dim, const std::string & name);
+
   // set the selection flag on all entities
   void setSelection(int val);