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/// This file is part of Rheolef.
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/// Copyright (C) 2000-2009 Pierre Saramito <Pierre.Saramito@imag.fr>
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/// Rheolef is free software; you can redistribute it and/or modify
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/// it under the terms of the GNU General Public License as published by
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/// the Free Software Foundation; either version 2 of the License, or
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/// (at your option) any later version.
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/// Rheolef is distributed in the hope that it will be useful,
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/// but WITHOUT ANY WARRANTY; without even the implied warranty of
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/// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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/// GNU General Public License for more details.
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/// You should have received a copy of the GNU General Public License
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/// along with Rheolef; if not, write to the Free Software
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/// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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/// =========================================================================
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using namespace rheolef;
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Float f (const point& x) { return 1+(0.5/N)*(x[0]*(1-x[0])+x[1]*(1-x[1])+x[2]*(1-x[2])); }
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Float g (const point& x) { return -0.5/N; }
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int main(int argc, char**argv) {
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environment distributed(argc, argv);
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Float prec = (argc > 2) ? atof(argv[2]) : 1e-10;
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N = omega.dimension();
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space Vh (omega, "P1");
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field fh = interpolate(Vh, f);
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form m (Vh, Vh, "mass");
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form a (Vh, Vh, "grad_grad");
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space Wh (omega["boundary"], "P1");
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field gh = interpolate(Wh, g);
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form mb (Wh, Vh, "mass");
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size_t max_iter = 10000;
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int status = pcg (c.uu, uh.u, m.uu*fh.u + m.ub*fh.b + mb.uu*gh.u + mb.ub*gh.b - a.ub*uh.b,
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eye<Float>(), max_iter, tol, &dcerr);
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dcout << setprecision(15) << compose(rounder(prec),uh);