45 lines
1.2 KiB
C++
45 lines
1.2 KiB
C++
#include "polynomial.hpp"
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#include "float.hpp"
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#include "debug.hpp"
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#include <algorithm>
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#include <cmath>
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#include <limits>
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int
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main (int, char**)
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{
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auto nan = std::numeric_limits<float>::quiet_NaN ();
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struct {
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std::array<float,4> coeffs;
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std::array<float,3> solutions;
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} CUBICS [] = {
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{ { 0, 0, -8, 7 }, { 7.f / 8, nan, nan } },
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{ { 0, 4, -8, 2 }, { 0.292893f, 1.70710f, nan } },
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{ { 1, 0, 0, 0 }, { 0, nan, nan } },
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{ { 1, 0, 2, 0 }, { 0, nan, nan } },
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{ { -2, 2, -2, 2 }, { 1, nan, nan } },
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{ { 1, 0, 0, 2 }, { -std::cbrt(2.f), nan, nan } },
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{ { 2, -3, 8, -2 }, { 0.2728376017309678f, nan, nan } },
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{ { 1, 4, -8, 7 }, { -5.6389f, nan, nan } },
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{ { 1, 3, -6, -8 }, { -4, -1, 2, } },
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};
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for (auto &i: CUBICS) {
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auto s = util::polynomial::solve (i.coeffs);
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std::sort (s.begin (), s.end ());
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for (size_t j = 0; j < 3; ++j) {
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std::cerr << i.solutions[j] << "==" << s[j] << '\n';
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bool equal = ieee_single::almost_equal (i.solutions[j], s[j], 864'026'624);
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bool invalid = std::isnan (i.solutions[j]) && std::isnan (s[j]);
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CHECK (equal || invalid);
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}
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}
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}
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