[Gmsh] help in reading element connectivity

[Octavio Castillo Reyes]

Dear Preety,

You need to write a Matlab script to import your mesh. This task is quite
simple, for instance:

% Formats
fstring  = '%s';
finteger = '%d';
fnodes   = '%d %f %f %f';
felems   = '%f %f %f %f %f %f %f %f';
% Open file
Idfile = fopen(mesh_file,'r');
% Read 4 lines (Header)
n = 4; textscan(Idfile,fstring,n,'Delimiter','\n');
% Read number of subdomains
n = 1; input = textscan(Idfile,finteger,n,'Delimiter','\n');
nsubdomains = input{1}(1);
% Read 2 + nsubdomains lines
n = 2 + nsubdomains; textscan(Idfile,fstring,n,'Delimiter','\n');
% Read number of nodes
n = 1; input = textscan(Idfile,finteger,n,'Delimiter','\n');
nNodes = input{1}(1);
% Read spatial positions of the nodes
n = nNodes; input = textscan(Idfile,fnodes,n,'Delimiter','\n');
nodes = transpose(horzcat(input{2},input{3},input{4}));
% Read 2 lines
n = 2; input = textscan(Idfile,fstring,n,'Delimiter', '\n');
% Read number of elements
n = 1; input = textscan(Idfile,finteger,n,'Delimiter','\n');
nElems = input{1}(1);
% Read nodal/elements connectivity
n = nElems; input = textscan(Idfile,felems,n,'Delimiter','\n');
elemsN = transpose(horzcat(input{6},input{7},input{8}));
% Read physical groups
phy_groups = input{4};
fclose(Idfile);


Otherwise, you can use the python parser by José A. Abell (
https://github.com/jaabell/gmshtranslator)

Best regards

O.



On Wed, Feb 21, 2018 at 5:41 PM, preetyobi at gmail.com <preetyobi at gmail.com>
wrote:

> Hi,
> I have created a 2D mesh in gmsh but able to understand how it is
> providing the elements connectivity also if possible provide me help
> regarding how to read this file in mathlab.
>
> Thank you
> Preety
>
> Send from my vivo smart phone
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