GNU Octave  4.0.0
A high-level interpreted language, primarily intended for numerical computations, mostly compatible with Matlab
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DET.h
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1 /*
2 
3 Copyright (C) 2008-2015 Jaroslav Hajek
4 
5 This file is part of Octave.
6 
7 Octave is free software; you can redistribute it and/or modify it
8 under the terms of the GNU General Public License as published by the
9 Free Software Foundation; either version 3 of the License, or (at your
10 option) any later version.
11 
12 Octave is distributed in the hope that it will be useful, but WITHOUT
13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
15 for more details.
16 
17 You should have received a copy of the GNU General Public License
18 along with Octave; see the file COPYING. If not, see
19 <http://www.gnu.org/licenses/>.
20 
21 */
22 
23 #if !defined (octave_DET_h)
24 #define octave_DET_h 1
25 
26 #include <cmath>
27 #include "oct-cmplx.h"
28 #include "lo-mappers.h"
29 
30 template <class T>
31 class
33 {
34 public:
35 
36  base_det (T c = 1, int e = 0)
37  : c2 (), e2 ()
38  {
39  c2 = xlog2 (c, e2);
40  e2 += e;
41  }
42 
43  base_det (T c, double e, double b)
44  : c2 (), e2 ()
45  {
46  e *= xlog2 (b);
47  e2 = e;
48  c *= xexp2 (e - e2);
49  int f;
50  c2 = xlog2 (c, f);
51  e2 += f;
52  }
53 
54  base_det (const base_det& a) : c2 (a.c2), e2 (a.e2) { }
55 
57  {
58  c2 = a.c2;
59  e2 = a.e2;
60  return *this;
61  }
62 
63  T coef (void) const { return c2; }
64  int exp (void) const { return e2; }
65 
66  T value () const { return c2 * static_cast<T> (std::ldexp (1.0, e2)); }
67  operator T () const { return value (); }
68 
69  base_det square () const { return base_det (c2*c2, e2+e2); }
70 
71  void operator *= (T t)
72  {
73  int e;
74  c2 *= xlog2 (t, e);
75  e2 += e;
76  }
77 
78 private:
79 
80  T c2;
81  int e2;
82 };
83 
84 // Provide the old types by typedefs.
89 
90 #endif
base_det< double > DET
Definition: DET.h:85
base_det< FloatComplex > FloatComplexDET
Definition: DET.h:88
int e2
Definition: DET.h:81
double xexp2(double x)
Definition: lo-mappers.cc:111
T coef(void) const
Definition: DET.h:63
base_det(const base_det &a)
Definition: DET.h:54
double xlog2(double x)
Definition: lo-mappers.cc:93
T value() const
Definition: DET.h:66
int exp(void) const
Definition: DET.h:64
base_det< float > FloatDET
Definition: DET.h:86
T c2
Definition: DET.h:80
base_det(T c=1, int e=0)
Definition: DET.h:36
ColumnVector & operator=(const ColumnVector &a)
Definition: dColVector.h:53
F77_RET_T const double const double * f
ComplexColumnVector operator*=(ComplexColumnVector &x, const Complex &y)
Definition: CColVector.h:149
Definition: DET.h:31
base_det square() const
Definition: DET.h:69
base_det< Complex > ComplexDET
Definition: DET.h:87
base_det(T c, double e, double b)
Definition: DET.h:43