Dear Ivan, Unfortunately, the assembly procedure of Getfem is not designed to compute such integro-differential term. May be if you have specific expression for the kernel (if it is simple or can be expressed on a FEM) it should be possible to adapt something.
Yves. Le 18/01/2013 12:24, Ivan Melikhov a écrit : > Hello! > > I need to solve an integro-differential eigenvalue problem and I have > trouble with integral term. Generally, I need to assemble a 4D matrix > with elements > \int\int(\phi_i(r')\phi_j(r')V(r,r')\phi_m(r)\phi_l(r))dr'dr I suppose it is \int\int(\phi_i(r)\phi_j(r')V(r,r')\phi_m(r)\phi_l(r))dr'dr (\phi_i(r) instead of \phi_i(r')) ? > where V(r,r') is known function, \phi_i is the ith base function, dr > is dxdy, dr' is dx'dy'. The question is how can I compute an inner > integral inside comp command in generic_assembly::set? > > Thank you for answers, > Ivan > > > _______________________________________________ > Getfem-users mailing list > [email protected] > https://mail.gna.org/listinfo/getfem-users -- Yves Renard ([email protected]) tel : (33) 04.72.43.87.08 Pole de Mathematiques, INSA-Lyon fax : (33) 04.72.43.85.29 20, rue Albert Einstein 69621 Villeurbanne Cedex, FRANCE http://math.univ-lyon1.fr/~renard ---------
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