Dear deal.II Community,

In my attempt to learn this library  I was working with step-3 tutorials 
where I wish to change my dirichlet boundary function to a bessel function 
instead of zero function but I ended up with a issue in visualization where 
I am not able to see any variation  on the mesh but I am able to run the 
program successfully.I have added the following code : 

 Point<2> center(1.5,1.5);
 Functions::Bessel1<2> bessel(1,2.5,center);
VectorTools::interpolate_boundary_values (dof_handler,
                                            0,
                                            bessel,
                                            boundary_values);

Although I may be wrong conceptually at various places and I look forward 
to any help in this context as my goal with this exercise  to just change 
the homogeneous boundary condition to inhomogeneous one.

Thankfully
Pushkar


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