Hello 

I have a problem with the solution vector grouped into <dim> components of 
displacement vector and one scalar component. 
So esentially my solution vector is  - (Ux, Uy, Uz, Scalar)

I want to modify the scalar with the help of the gradients of the 
displacement vector after solving the system of equations. 

As I see I have two posibilities of modifying only one component of the 
solution vector:
a) with the help of block vectors
b) with the help of component mask as described in: 
https://groups.google.com/d/msg/dealii/Cy2hwxPuM0U/DiY6Wx-SCQAJ

The problem that I am facing is that even if i extract the component of the 
solution that I want to modify, I can't extract the information about the 
gradient of the other component at the same node. We can extract the value 
of the solution as well as the gradient at the same quadrature point, but 
how can we do it for a given node? 

Regards,
Prateek

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