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[Ianic <>]

To make things clearer, I am talking here about the "File_medit.h"
functionality. Basically, when I output the Vertices section of a .mesh
file, I want to exclude the nodes for which ( get(vertex_pmap, vit) == -1 ).
I wanted to do this because I thought these vertices would be unreferenced
in the sense that they would not belong to any cell of c3t3 complex. But
this is not the case and I wonder why. 

Unfortunately, the File_medit.h file is overall too cryptic for my level of
C++ proficiency, but I believe that get(vertex_pmap, vit) function should
give a subdomain index of any cell incident to the vertex. In my case it
sometimes gives "-1" but I have checked that some of those "-1" vertices
belong to cells of c3t3 for which get(cell_pmap, cit) gives "2".
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