fem2d_poisson_rectangle_linear_test, a Fortran90 code which calls fem2d_poisson_rectangle_linear(), which solves the 2D Poisson equation using the finite element method over a rectangular region using a uniform mesh of linear triangular elements.
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fem2d_poisson_rectangle_linear, a Fortran90 code which solves the 2D Poisson equation on a rectangle, using the finite element method (FEM), and piecewise linear triangular elements.