Re: [Getfem-users] Node renumbering's question

[Mirko Windhoff]

Dear Veronique,

using the Matlab Interface I used the following workaround to map my
variable fi on a mesh to mesh_fem order:

% get mesh to mesh_fem order map
cvids=gf_mesh_fem_get(mf, 'convex_index');
m_pid_cvid=gf_mesh_get(m, 'pid from cvid', cvids);
mf_dof_cvid=gf_mesh_fem_get(mf, 'dof from cvid', cvids);
m_mf_map(m_pid_cvid(:))=mf_dof_cvid(:);

% reorder fi to mesh_fem order
fi_mf=zeros(1,size(fi_mesh,1);
fi_mf(m_mf_map(1:size(fi_mesh,1)))=fi_mesh(1:size(fi_mesh,1));

% now we can use fi_mf on the mesh_fem to calculate for example the gradient:
Dfi=gf_compute(mf, fi_mf, 'gradient', mf);

Here is what Ives suggested to me in that case:
http://www.mail-archive.com/address@hidden

Using the c++ library you may be have to do something similar...
Regards,
Mirko

2009/7/27 Véronique Pham <address@hidden>:
> Hi everyone,
>
> Here is another wondering about the library.
>
> I have a mesh file with values at each node. I can load the mesh into a
> getfem::mesh but when I apply P1 shape function to the linked
> getfem::mesh_fem, the node are renumberer. How can I use the value in the
> file in this case?
> I have seen interpolate function and interpolate mesh but they do not
> correspond to what I want to do.
> Should I hack the lib to make the renumbering optional, or to save it
> somewhere? or do you see a better method?
> I suppose I could also traverse all the element and try to find the
> renumbering afterward by matching coordinate, but it seen a waste of
> computationnal time.
> This seems like a standard operation to me, surely there is already
> something available?
>
> Thanks for your help.
> Véronique.
>
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