added dataframe normalization tool for range setting

Author: gcerutti

src/openalea/cellcomplex/property_topomesh/utils/pandas_tools.py

@@ -21,4 +21,10 @@ def topomesh_to_dataframe(topomesh, degree=3, properties=None):
     dataframe = dataframe.set_index('id')
     dataframe.index.name = None
 
-    return dataframe
+    return dataframe
+
+def normalized_data_range(data_range, dataframe, property_name):
+    return tuple([100.*(s-dataframe[property_name].min())/(dataframe[property_name].max()-dataframe[property_name].min()) for s in data_range])
+        
+
+