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Re: [Getfem-users] Problem with mixed meshes

From: Yves Renard
Subject: Re: [Getfem-users] Problem with mixed meshes
Date: Thu, 14 Jun 2018 14:52:21 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.8.0

Dear Phuoc,

No, I see no reason. If you can just send me the mesh in a format readable by GetFEM, I could check what is wrong.

Best regards,


Le 14/06/2018 à 10:24, Huu Phuoc BUI a écrit :
Dear Getfem-users,

I have a problem with computing the outer faces when using a mixed mesh (having tetras, hexa, prisms and pyramids).

The error is:

face_left = m.outer_faces_with_direction([0, 0., -1.0], 0.01)
  File "/usr/local/lib/python2.7/dist-packages/getfem/", line 1372, in outer_faces_with_direction
    return self.get("outer_faces_with_direction", v, angle, CVIDs)
  File "/usr/local/lib/python2.7/dist-packages/getfem/", line 1152, in get
    return getfem('mesh_get',, *args)
RuntimeError: (Getfem::InterfaceError) -- Error in, line 381 const base_matrix& bgeot::geotrans_interpolation_context::B() const:
Non invertible matrix

Please let me know if you have any idea. Thank you.

Best regards,



  Yves Renard (address@hidden)       tel : (33)
  Pole de Mathematiques, INSA-Lyon             fax : (33)
  20, rue Albert Einstein
  69621 Villeurbanne Cedex, FRANCE


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