Hello,

If you look at the mesh file you'll see lines like this describing an element

1 16 0 99 2    7   65   66  399  318  489   63   64

Comparing it with the .msh ASCII format (http://gmsh.info/doc/texinfo/gmsh.html#MSH-ASCII-file-format), you'll see that the third number describes the number of tags. Since it's 0, the next number is considered to be a start of sequence on nodes, and you get an error. My guess is that 0 and 2 are accidentally swapped in that software you use, because obviously there are 2 tags followed by 8 nodes.

Best regards,
Mikhail



On 07/05/2016 05:01 AM, [email protected] wrote:
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Today's Topics:

    1. 8 node quads mesh (tshering lhamo)


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Message: 1
Date: Tue, 5 Jul 2016 10:48:27 +0200
From: tshering lhamo <[email protected]>
To: [email protected]
Subject: [Gmsh] 8 node quads mesh
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        <cahgaovpm0+r4cyx0u0qgvxnf_hka_ckqoebvoxuwcyrbvyq...@mail.gmail.com>
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Hello,

I have a .LAG file generated from Lagamine (which using Matlab was used to
generate a mesh file to be opened with GMSH) . The mesh has 8 node
quadrilaterals. Whenever I try to open with GMSH, it says Vertex Index
Error.
I would like to attach the file here. I was wondering if there was a way
check to why the error.
Thank you so much.
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