Jimmy,

Is this 
https://github.com/dealii/dealii/wiki/Frequently-Asked-Questions#how-to-get-the-mapped-position-of-support-points-of-my-element
 
what you are looking for?

Best,

Bruno

On Monday, June 22, 2020 at 1:32:43 AM UTC-4, Jimmy Ho wrote:
>
> Dear All,
>
> I am trying to write a code to give initial condition for a vector of 
> FullMatrix<double> objects. The initial value of each entry of each matrix 
> is uniquely defined by the corresponding nodal location. Hence, I am 
> looking for an easy way to iterate all nodes (including mid-side nodes) in 
> the mesh and access their coordinates. Is there a way to do so?
>
> I am aware of the Interpolate() function in VectorTools. However, the 
> documentation for this function show that the input function to interpolate 
> must have the same number of components as the number of components in the 
> vector-valued finite element. This is not the case for me, since the 
> initial values of the matrix are not directly linked to the DoFs of the 
> finite element. I also considered making the entries of the matrices as 
> extra DoFs of the finite element, then I will be able to use Interpolate() 
> and some component masks to assign initial values. But this idea is 
> sub-optimal, since in subsequent calculations, the values of the entries 
> can be directly computed using other DoFs of the finite element as well as 
> their previous values. So there's really no point posing them as additional 
> DoFs of the finite element. Is there any suggestions on how to achieve this?
>
> Thanks a lot for any discussions and suggestions! Your help is much 
> appreciated!
>
> Best,
> Jimmy
>

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