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3.9.6 Precise
This keyword warns Gfem that precise quadrature formula must be
used. Hence array-functions are discretized as piecewise linear
discontinuous functions on the triangulation. Then all integrals are
computed with 3 inner Gauss points slightly inside each triangle.
This option consumes more memory (3nt instead of ns per functions,
i.e. 9 times more approximately, but still it is nothing compared with
the memory that a matrix of the linear system of a PDE requires) because
each array-function is stored by 3 values on each triangles.
It is a good idea to use it in conjunction with convect
and/or discontinuous nonlinear terms.
Christophe Prud'homme
