Build the finite element right-hand side of a diffusion problem employing mass-lumping.
The equation taken into account is:
delta * u = f * g
where f is an element-wise constant scalar function, while g is a piecewise linear conforming scalar function.
See also: bim1a_reaction, bim1a_advection_diffusion, bim1a_laplacian, bim2a_reaction, bim3a_reaction.
Package: bim