I am following example 52 for writing code which should solve a system of
three equations. In it I can rewrite my equations such that my source term
is zero, but my matrices on the left side are depending on time, which
means that I have to reassemble the system matrix and the inverse system
matrix at every time step. Is that a good idea, or rather
performance-degrading? The function
assemble_system()
has been rewritten to
assemble_system(const double time)
Furthermore I then have to call
assemble_system(time)
in the function
evaluate_diffusion(const double time, const Vector<double> &y)
but compilation fails with
error: passing ‘const Step52::Diffusion<3>’ as ‘this’ argument discards
qualifiers [-fpermissive]
assemble_system(time);
but why? And how can I fix that?
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