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Function File: [C] = bim3a_reaction (mesh,delta,zeta)

Build the lumped finite element mass matrix for a diffusion problem.

The equation taken into account is:

delta * zeta * u = f

where delta is an element-wise constant scalar function, while zeta is a piecewise linear conforming scalar function.

See also: bim3a_rhs, bim3a_laplacian, bim2a_reaction, bim3a_reaction.

Package: bim