Hi, 

  Does MeshFunction expect the vector (input argument for constructor) to be 
serialized and hold the global solution? 

  I am attempting to use the class in my code. Passing it the system.solution 
without serializing it is leading to nans as the interpolated solution at the 
boundary of each partition on processor_id != 0. 

  I looked at the code in exact_solution.C and exact_error_estimator.C, both of 
which serialize the solution before passing it to MeshFunction. Not sure why 
this would be necessary. 

Thanks, 
Manav



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