Mercurial > octave-nkf
annotate liboctave/DET.h @ 8721:e9cb742df9eb
imported patch sort3.diff
| author | Jaroslav Hajek <highegg@gmail.com> |
|---|---|
| date | Wed, 11 Feb 2009 15:25:53 +0100 |
| parents | 9813c07ca946 |
| children | 3c1762c7e787 |
| rev | line source |
|---|---|
| 8335 | 1 /* |
| 2 | |
| 3 Copyright (C) 2008 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 | |
| 32 OCTAVE_API | |
| 33 base_det | |
| 34 { | |
| 35 public: | |
| 36 | |
|
8336
9813c07ca946
make det take advantage of matrix type
Jaroslav Hajek <highegg@gmail.com>
parents:
8335
diff
changeset
|
37 base_det (T c = 1, int e = 0) |
| 8335 | 38 { |
| 39 c2 = xlog2 (c, e2); | |
| 40 e2 += e; | |
| 41 } | |
| 42 | |
| 43 base_det (T c, double e, double b) | |
| 44 { | |
| 45 e *= xlog2 (b); | |
| 46 e2 = e; | |
| 47 c *= xexp2 (e - e2); | |
| 48 int f; | |
| 49 c2 = xlog2 (c, f); | |
| 50 e2 += f; | |
| 51 } | |
| 52 | |
| 53 base_det (const base_det& a) : c2(a.c2), e2(a.e2) { } | |
| 54 | |
| 55 base_det& operator = (const base_det& a) | |
| 56 { | |
| 57 c2 = a.c2; | |
| 58 e2 = a.e2; | |
| 59 return *this; | |
| 60 } | |
| 61 | |
| 62 T coef (void) const { return c2; } | |
| 63 int exp (void) const { return e2; } | |
| 64 | |
| 65 T value () const { return c2 * static_cast<T> (std::ldexp (1.0, e2)); } | |
| 66 operator T () const { return value (); } | |
| 67 | |
|
8336
9813c07ca946
make det take advantage of matrix type
Jaroslav Hajek <highegg@gmail.com>
parents:
8335
diff
changeset
|
68 base_det square () const { return base_det (c2*c2, e2+e2); } |
|
9813c07ca946
make det take advantage of matrix type
Jaroslav Hajek <highegg@gmail.com>
parents:
8335
diff
changeset
|
69 |
| 8335 | 70 void operator *= (T t) |
| 71 { | |
| 72 int e; | |
| 73 c2 *= xlog2 (t, e); | |
| 74 e2 += e; | |
| 75 } | |
| 76 | |
| 77 private: | |
| 78 | |
| 79 T c2; | |
| 80 int e2; | |
| 81 }; | |
| 82 | |
| 83 // Provide the old types by typedefs. | |
| 84 typedef base_det<double> DET; | |
| 85 typedef base_det<float> FloatDET; | |
| 86 typedef base_det<Complex> ComplexDET; | |
| 87 typedef base_det<FloatComplex> FloatComplexDET; | |
| 88 | |
| 89 #endif |