| // 2007-02-04 Edward Smith-Rowland <3dw4rd@verizon.net> |
| // |
| // Copyright (C) 2007-2014 Free Software Foundation, Inc. |
| // |
| // This file is part of the GNU ISO C++ Library. This library is free |
| // software; you can redistribute it and/or modify it under the |
| // terms of the GNU General Public License as published by the |
| // Free Software Foundation; either version 3, or (at your option) |
| // any later version. |
| // |
| // This library is distributed in the hope that it will be useful, |
| // but WITHOUT ANY WARRANTY; without even the implied warranty of |
| // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| // GNU General Public License for more details. |
| // |
| // You should have received a copy of the GNU General Public License along |
| // with this library; see the file COPYING3. If not see |
| // <http://www.gnu.org/licenses/>. |
| |
| // expint |
| |
| |
| // Compare against values generated by the GNU Scientific Library. |
| // The GSL can be found on the web: http://www.gnu.org/software/gsl/ |
| |
| #include <tr1/cmath> |
| #if defined(__TEST_DEBUG) |
| #include <iostream> |
| #define VERIFY(A) \ |
| if (!(A)) \ |
| { \ |
| std::cout << "line " << __LINE__ \ |
| << " max_abs_frac = " << max_abs_frac \ |
| << std::endl; \ |
| } |
| #else |
| #include <testsuite_hooks.h> |
| #endif |
| #include "../testcase.h" |
| |
| |
| // Test data. |
| testcase_expint<double> data001[] = { |
| { -3.7832640295504591e-24, -50.000000000000000 }, |
| { -1.0489811642368024e-23, -49.000000000000000 }, |
| { -2.9096641904058423e-23, -48.000000000000000 }, |
| { -8.0741978427258127e-23, -47.000000000000000 }, |
| { -2.2415317597442998e-22, -46.000000000000000 }, |
| { -6.2256908094623838e-22, -45.000000000000000 }, |
| { -1.7299598742816476e-21, -44.000000000000000 }, |
| { -4.8094965569500181e-21, -43.000000000000000 }, |
| { -1.3377908810011775e-20, -42.000000000000000 }, |
| { -3.7231667764599780e-20, -41.000000000000000 }, |
| { -1.0367732614516570e-19, -40.000000000000000 }, |
| { -2.8887793015227007e-19, -39.000000000000000 }, |
| { -8.0541069142907499e-19, -38.000000000000000 }, |
| { -2.2470206975885714e-18, -37.000000000000000 }, |
| { -6.2733390097622421e-18, -36.000000000000000 }, |
| { -1.7527059389947371e-17, -35.000000000000000 }, |
| { -4.9006761183927874e-17, -34.000000000000000 }, |
| { -1.3713843484487468e-16, -33.000000000000000 }, |
| { -3.8409618012250666e-16, -32.000000000000000 }, |
| { -1.0767670386162383e-15, -31.000000000000000 }, |
| { -3.0215520106888128e-15, -30.000000000000000 }, |
| { -8.4877597783535618e-15, -29.000000000000000 }, |
| { -2.3869415119337330e-14, -28.000000000000000 }, |
| { -6.7206374352620390e-14, -27.000000000000000 }, |
| { -1.8946858856749785e-13, -26.000000000000000 }, |
| { -5.3488997553402167e-13, -25.000000000000000 }, |
| { -1.5123058939997059e-12, -24.000000000000000 }, |
| { -4.2826847956656722e-12, -23.000000000000000 }, |
| { -1.2149378956204371e-11, -22.000000000000000 }, |
| { -3.4532012671467559e-11, -21.000000000000000 }, |
| { -9.8355252906498815e-11, -20.000000000000000 }, |
| { -2.8078290970607954e-10, -19.000000000000000 }, |
| { -8.0360903448286769e-10, -18.000000000000000 }, |
| { -2.3064319898216547e-09, -17.000000000000000 }, |
| { -6.6404872494410427e-09, -16.000000000000000 }, |
| { -1.9186278921478670e-08, -15.000000000000000 }, |
| { -5.5656311111451816e-08, -14.000000000000000 }, |
| { -1.6218662188014328e-07, -13.000000000000000 }, |
| { -4.7510818246724931e-07, -12.000000000000000 }, |
| { -1.4003003042474418e-06, -11.000000000000000 }, |
| { -4.1569689296853246e-06, -10.000000000000000 }, |
| { -1.2447354178006272e-05, -9.0000000000000000 }, |
| { -3.7665622843924906e-05, -8.0000000000000000 }, |
| { -0.00011548173161033820, -7.0000000000000000 }, |
| { -0.00036008245216265867, -6.0000000000000000 }, |
| { -0.0011482955912753257, -5.0000000000000000 }, |
| { -0.0037793524098489058, -4.0000000000000000 }, |
| { -0.013048381094197037, -3.0000000000000000 }, |
| { -0.048900510708061125, -2.0000000000000000 }, |
| { -0.21938393439552029, -1.0000000000000000 }, |
| }; |
| |
| // Test function. |
| template <typename Tp> |
| void test001() |
| { |
| const Tp eps = std::numeric_limits<Tp>::epsilon(); |
| Tp max_abs_diff = -Tp(1); |
| Tp max_abs_frac = -Tp(1); |
| unsigned int num_datum = sizeof(data001) |
| / sizeof(testcase_expint<double>); |
| for (unsigned int i = 0; i < num_datum; ++i) |
| { |
| const Tp f = std::tr1::expint(Tp(data001[i].x)); |
| const Tp f0 = data001[i].f0; |
| const Tp diff = f - f0; |
| if (std::abs(diff) > max_abs_diff) |
| max_abs_diff = std::abs(diff); |
| if (std::abs(f0) > Tp(10) * eps |
| && std::abs(f) > Tp(10) * eps) |
| { |
| const Tp frac = diff / f0; |
| if (std::abs(frac) > max_abs_frac) |
| max_abs_frac = std::abs(frac); |
| } |
| } |
| VERIFY(max_abs_frac < Tp(2.5000000000000020e-13)); |
| } |
| |
| int main(int, char**) |
| { |
| test001<double>(); |
| return 0; |
| } |