[Gmsh] reclassify tool

[Umut Tabak]

Dear all,

I am trying to assign some physical entities to my mesh that I exported 
from ANSYS, that is a simple cube structure.

I would like to assign a physical entity group to the lines at 
circumference of the surface that is at z=0. This should be possible I 
guess, because some time ago, I got some message from Christophe, that 
it is possible. However, going to reclassify tool in mesh module, I can 
not select elements or conduct any operations on the mesh. There is 
still sth wrong. Could someone help me on this?

Best,
Umut

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