Dear Getfem++ Users,

I have the following bricks, in my assembled and working matrix, using
MATLAB Interface

gf_model_set (md, 'add nonlinear generic assembly brick', mimLp,
'Grad_uv.Test_pv', -1, 0, 0);
gf_model_set (md, 'add nonlinear generic assembly brick', mimLv,
'-pv.Grad_Test_uv', -1, 0, 0);

where uv and pv are two of the four unknowns of the system, and the mesh is
a straight segment LambdaM defined as follows
Lambdaref= 0:1/(nbsk-1):1;
LambdaM=gf_mesh('cartesian', Lambdaref);

and mimLp and mimLv are the integration methods for pv and uv respectively
over LambdaM.

This is running properly, my problem starts when I modify the mesh.
Instead of having one single segment I have a Y-shaped 1D mesh composed of
3 segments assembled by the 'add point' command. Every singe segment
corresponds to a region.

I tried to implement the same code either over the single regions, either
on the whole domain and in both cases I received the error "error in
assembly string".
Do you have any idea of what the problem could be?

Thank you for your support,
Davide Manfredo

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