Hello, this simply indicates that you either do not have sufficient terms or boundary conditions for solving for all variables that you have added to your model. BR Kostas
On Thu, Sep 29, 2022 at 11:42 AM lahoussaine BOURRICHE < lahoussaine.bourri...@gmail.com> wrote: > Hello community > I'm trying to resolve FEM using an add.macro of an expression that is not > polynomial ( I use atan ), but every time I get " Solve with MUMPS failed: > matrix is singular." . Even if it converges the solution is not correct. > > Do you have any ideas ? > > thanks >
