Hello SfePy!<br><br>I am solving the Poisson problem and during my solution I got the warning:<br><br>Warning:<br>/usr/local/lib/python2.7/dist-packages/sfepy/fem/fields_base.py:1258: RuntimeWarning: invalid value encountered in divide<br>&nbsp; data_vertex /= nod_vol[:,nm.newaxis]<br><br>The code for this warning:<br>&nbsp;&nbsp;&nbsp; def post_process(out, pb, state, extend = False):&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; # evaluate gradient in nodes
<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; grad_data = pb.evaluate('ev_grad.i1.Omega(u)', mode = 'qp')
<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; grad_field = H1NodalVolumeField('grad', np.float64, (3, ),
<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; pb.domain.regions['Omega'])
<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; grad_var = FieldVariable('grad', 'parameter', grad_field, 3,
<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; primary_var_name='(set-to-None)')
<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <b>grad_var.data_from_qp(grad_data, pb.integrals['i1'])
</b><br><br>This warning is appeared only for the meshes with superfluous vertices. The code and the meshes is in the attachment. I think this warning my be related to the issue with superfluous vertices. See early discussion [1] and git commit [2]<br><br>[1] https://groups.google.com/forum/?fromgroups=#!topic/sfepy-devel/3Qae2M5bBps<br>[2] https://github.com/sfepy/sfepy/commit/4ef0f5dbc7fac15942ba2031debf1296a35eb41f<br><br>Sincerely,<br>Alec<br>