poisson_1d_multigrid_test, a Fortran90 code which calls poisson_1d_multigrid(), which applies a multigrid method to solve the linear system associated with a discretized version of the 1D Poisson equation.
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poisson_1d_multigrid, a Fortran90 code which applies the multigrid method to a discretized version of the 1D Poisson equation.