On Sun, Jul 19, 2020 at 7:36 PM Wolfgang Bangerth <bange...@colostate.edu>

> On 7/19/20 6:28 PM, Daniel Arndt wrote:
> >
> >     The tutorial examples show only how to access values of the solution
> at
> >     the quadrature points within each cell.
> >
> >
> https://github.com/dealii/dealii/wiki/Frequently-Asked-Questions#how-to-get-the-mapped-position-of-support-points-of-my-element
> > <
> https://nam01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fdealii%2Fdealii%2Fwiki%2FFrequently-Asked-Questions%23how-to-get-the-mapped-position-of-support-points-of-my-element&data=02%7C01%7CWolfgang.Bangerth%40colostate.edu%7Cc61491e1703e46c5be0f08d82c43defe%7Cafb58802ff7a4bb1ab21367ff2ecfc8b%7C0%7C0%7C637308017305040965&sdata=TM3AYA4IqcrckUMqRTWfCJWUz3MGrUx%2FRFGvRrsg40Y%3D&reserved=0>
> > might also be helpful.
> You might also be interested in looking at the do_half_phase_step()
> function
> of step-58:
> https://dealii.org/developer/doxygen/deal.II/step_58.html#ImplementingtheStrangsplittingsteps
> Best
>   W.
> Thank both of you for your replies. The Step-58 function is very helpful
in showing how to access nodal point values of a solution vector object. I
assume I can access the nodal point coordinates in the similar way, where a
vector of nodal points is created using the

However, I have two more related questions. BTW, I am a newbie in C++
programming. So my questions may seem absurd.

   1. Now that we have a vector holding all nodal point coordinates, and
   another vector holding all nodal point values of the solution. How do we
   access every nodal point coordinates, and at the same time, the associated
   nodal point value within the same loop?
   2. In addition to nodal point values of a solution, are the partial
   derivatives (or gradient) of the solution at each nodal point available in

Thanks again for any assistance!

Stay put, practice social distancing, and be safe!


--Xuefeng Li, (504)865-3340(phone)
   Like floating clouds, the heart rests easy
   Like flowing water, the spirit stays free
      Loyola University New Orleans
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