Error, please help
Created by: riemannium
I am just learning SAGE,...I plan to use for my current Master Thesis and the future...SAGE Manifolds and the jupyter notebook for Kerr metric produces both in my computer and online the following error:
AttributeError Traceback (most recent call last) in () ----> 1 g = M.lorentzian_metric('g')
/projects/sage/sage-7.3/src/sage/structure/parent.pyx in sage.structure.parent.Parent.getattr (/projects/sage/sage-7.3/src/build/cythonized/sage/structure/parent.c:8222)() 853 return attr 854 except TypeError: --> 855 attr = getattr_from_other_class(self, self._category.parent_class, name) 856 self.__cached_methods = {name:attr} 857 return attr
/projects/sage/sage-7.3/src/sage/structure/misc.pyx in sage.structure.misc.getattr_from_other_class (/projects/sage/sage-7.3/src/build/cythonized/sage/structure/misc.c:1772)() 251 dummy_error_message.cls = type(self) 252 dummy_error_message.name = name --> 253 raise dummy_attribute_error 254 try: 255 attribute = getattr(cls, name)
AttributeError: 'DifferentiableManifold_with_category' object has no attribute 'lorentzian_metric'
PLEASE, ... Help me! I am in love with SAGE, and SAGEmanifolds, but I need to power use it yet!!!!