Dear DEAL.II community,

I'm currently working on solving an elasticity problem based on the step-8 
tutorial. In my simulation, I've successfully prescribed boundary values 
for an edge of the triangulation using the following code:

 VectorTools::interpolate_boundary_values( mapping, dof_handler, 
                                              3, 
                                              
Functions::ZeroFunction<dim>(dim), 
                                              constraints,
                                              
ComponentMask(std::vector<bool>{true, false}));

In this code, '3' represents the boundary ID of an edge. However, I now 
need to assign these same boundary values to a node instead of the entire 
edge. Could you please advise on how to implement this?

Thanks in advance.
Veerendra

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