> I can now pin point the reason that the stiff_matrix term explodes from
> order 5 onwards. It works perfectly fine till order 4 and then the values
> in stiff_matrix vary hugely(and I have no explanation for this :(   ).

Have you looked at the local contributions to the stiffness matrix and made 
sure they are correct?

W.

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Wolfgang Bangerth                email:            [email protected]
                                 www: http://www.math.tamu.edu/~bangerth/

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