Mercurial > octave
view liboctave/numeric/DET.h @ 33587:a56b2283959a default tip @
maint: Merge stable to default.
author | Markus Mützel <markus.muetzel@gmx.de> |
---|---|
date | Thu, 16 May 2024 08:42:51 +0200 |
parents | 4b601ca024d5 |
children |
line wrap: on
line source
//////////////////////////////////////////////////////////////////////// // // Copyright (C) 2008-2024 The Octave Project Developers // // See the file COPYRIGHT.md in the top-level directory of this // distribution or <https://octave.org/copyright/>. // // This file is part of Octave. // // Octave 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 of the License, or // (at your option) any later version. // // Octave 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 Octave; see the file COPYING. If not, see // <https://www.gnu.org/licenses/>. // //////////////////////////////////////////////////////////////////////// #if ! defined (octave_DET_h) #define octave_DET_h 1 #include "octave-config.h" #include <cmath> #include "lo-mappers.h" #include "oct-cmplx.h" template <typename T> class base_det { public: base_det (T c = 1, int e = 0) : m_c2 (), m_e2 () { m_c2 = octave::math::log2 (c, m_e2); m_e2 += e; } base_det (T c, double e, double b) : m_c2 (), m_e2 () { e *= octave::math::log2 (b); m_e2 = e; c *= octave::math::exp2 (e - m_e2); int f; m_c2 = octave::math::log2 (c, f); m_e2 += f; } OCTAVE_DEFAULT_COPY_MOVE_DELETE (base_det) T coef () const { return m_c2; } int exp () const { return m_e2; } T value () const { return m_c2 * static_cast<T> (std::ldexp (1.0, m_e2)); } operator T () const { return value (); } base_det square () const { return base_det (m_c2*m_c2, m_e2+m_e2); } void operator *= (T t) { int e; m_c2 *= t; // Renormalize m_c2 to [0.5, 1), and find required change in exponent. m_c2 = octave::math::log2 (m_c2, e); m_e2 += e; } private: T m_c2; int m_e2; }; // Provide the old types by typedefs. typedef base_det<double> DET; typedef base_det<float> FloatDET; typedef base_det<Complex> ComplexDET; typedef base_det<FloatComplex> FloatComplexDET; #endif