Re: Vector Data as Parameter

[Yves Renard]

Dear Yvonne DeMedici,

I understand that you use the Matlab interface. There should be a message 
accompagning the error "Error in assembly string". Probably, in your case, "vt" 
as not been properly added to the model. In order to be used in an assembly 
string, a data has to be added to the model first. If it is a vector or tensor 
data, it has to be declared accordingly.

Best regards,

Yves


----- Mail original -----
De: "Yvonne DeMedici" <address@hidden>
À: "getfem-users" <address@hidden>
Envoyé: Vendredi 25 Octobre 2019 10:18:26
Objet: Vector Data as Parameter

Dear GetFem++ community,
Thank you very much for you attention.
I'm trying to implement a Heat transfer equation, and I successfully inserted 
in the model every single brick including the transient term, a part from the 
convection (or advection) term. 
My variational form of this term would be \int T \textbf{v} \cdot \Nabla \xi  
(with \xi test function Test_T, and \textbf{v} a known vector field). 
Let's make things easier and let me define the degrees of freedon as 
>>dof=gf_mesh_fem_get(mf, 'nbdof'); 
and  \textbf{v} as 
>>vt=ones(dof, dof, 3).My problem is the fact that, using the command 
>>gf_model_set(md, 'add nonlinear generic assembly brick', mim, 
>>'(vt*T).Grad_test_T', -1);  
with T Temperature as the unknown variable,
I receive the error>>"Error in assembly string". 
Could you help me understand what is happening here?

Thank you again,
Best wishes
DeMedici Y.