[Getfem-users] assembling a vectorial source

[Alex Magnes]

hi everybody!

another question concerning the generic assembling procedures. i try to 
assemble a volumic source term "integral grad(Ni).Ts", where Ni are the 
basis functions of a scalar fem and Ts is a vectorial source term. so i 
set up a mesh with a data-fem with "FEM_NEDELEC(3)" elements and a 
"FEM_PK(3,1)" for setting the scalar basis functions.
then:

   assemble_source_term.push_mi(im);
   assemble_source_term.push_mf(mf_scalar);
   assemble_source_term.push_mf(mf_Ts);
   assemble_source_term.push_data(Ts);     <- input data, length=dof of 
the nedelec fem.
   assemble_source_term.push_vec(result);
   assemble_source_term.set("F=data(qdim(#1),#2);" " 
V(#1)+=comp(Grad(#1).vBase(#2))(???????).F(???);");
   assemble_source_term.assembly();

my problem is, i do not really understand the reduction operation 
mentioned in the documentation, because i'm not familiar with tensor 
notation. the examples i found in the tests folder just showed how to 
handle something like "comp(Base(#1).vBase(#2))".
so how do i have to set these indices to get a result?
i hope i did a proper problem description and someone can help me.

best regards and thanks in advance, alex