level1_impl.h
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1 // This file is part of Eigen, a lightweight C++ template library
2 // for linear algebra.
3 //
4 // Copyright (C) 2009-2010 Gael Guennebaud <gael.guennebaud@inria.fr>
5 //
6 // This Source Code Form is subject to the terms of the Mozilla
7 // Public License v. 2.0. If a copy of the MPL was not distributed
8 // with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
9 
10 #include "common.h"
11 
12 int EIGEN_BLAS_FUNC(axpy)(const int *n, const RealScalar *palpha, const RealScalar *px, const int *incx, RealScalar *py, const int *incy)
13 {
14  const Scalar* x = reinterpret_cast<const Scalar*>(px);
15  Scalar* y = reinterpret_cast<Scalar*>(py);
16  Scalar alpha = *reinterpret_cast<const Scalar*>(palpha);
17 
18  if(*n<=0) return 0;
19 
20  if(*incx==1 && *incy==1) make_vector(y,*n) += alpha * make_vector(x,*n);
21  else if(*incx>0 && *incy>0) make_vector(y,*n,*incy) += alpha * make_vector(x,*n,*incx);
22  else if(*incx>0 && *incy<0) make_vector(y,*n,-*incy).reverse() += alpha * make_vector(x,*n,*incx);
23  else if(*incx<0 && *incy>0) make_vector(y,*n,*incy) += alpha * make_vector(x,*n,-*incx).reverse();
24  else if(*incx<0 && *incy<0) make_vector(y,*n,-*incy).reverse() += alpha * make_vector(x,*n,-*incx).reverse();
25 
26  return 0;
27 }
28 
29 int EIGEN_BLAS_FUNC(copy)(int *n, RealScalar *px, int *incx, RealScalar *py, int *incy)
30 {
31  if(*n<=0) return 0;
32 
33  Scalar* x = reinterpret_cast<Scalar*>(px);
34  Scalar* y = reinterpret_cast<Scalar*>(py);
35 
36  // be careful, *incx==0 is allowed !!
37  if(*incx==1 && *incy==1)
38  make_vector(y,*n) = make_vector(x,*n);
39  else
40  {
41  if(*incx<0) x = x - (*n-1)*(*incx);
42  if(*incy<0) y = y - (*n-1)*(*incy);
43  for(int i=0;i<*n;++i)
44  {
45  *y = *x;
46  x += *incx;
47  y += *incy;
48  }
49  }
50 
51  return 0;
52 }
53 
55 {
56  using std::sqrt;
57  using std::abs;
58 
59  Scalar& a = *reinterpret_cast<Scalar*>(pa);
60  Scalar& b = *reinterpret_cast<Scalar*>(pb);
61  RealScalar* c = pc;
62  Scalar* s = reinterpret_cast<Scalar*>(ps);
63 
64  #if !ISCOMPLEX
65  Scalar r,z;
66  Scalar aa = abs(a);
67  Scalar ab = abs(b);
68  if((aa+ab)==Scalar(0))
69  {
70  *c = 1;
71  *s = 0;
72  r = 0;
73  z = 0;
74  }
75  else
76  {
77  r = sqrt(a*a + b*b);
78  Scalar amax = aa>ab ? a : b;
79  r = amax>0 ? r : -r;
80  *c = a/r;
81  *s = b/r;
82  z = 1;
83  if (aa > ab) z = *s;
84  if (ab > aa && *c!=RealScalar(0))
85  z = Scalar(1)/ *c;
86  }
87  *pa = r;
88  *pb = z;
89  #else
90  Scalar alpha;
91  RealScalar norm,scale;
92  if(abs(a)==RealScalar(0))
93  {
94  *c = RealScalar(0);
95  *s = Scalar(1);
96  a = b;
97  }
98  else
99  {
100  scale = abs(a) + abs(b);
101  norm = scale*sqrt((numext::abs2(a/scale)) + (numext::abs2(b/scale)));
102  alpha = a/abs(a);
103  *c = abs(a)/norm;
104  *s = alpha*numext::conj(b)/norm;
105  a = alpha*norm;
106  }
107  #endif
108 
109 // JacobiRotation<Scalar> r;
110 // r.makeGivens(a,b);
111 // *c = r.c();
112 // *s = r.s();
113 
114  return 0;
115 }
116 
118 {
119  if(*n<=0) return 0;
120 
121  Scalar* x = reinterpret_cast<Scalar*>(px);
122  Scalar alpha = *reinterpret_cast<Scalar*>(palpha);
123 
124  if(*incx==1) make_vector(x,*n) *= alpha;
125  else make_vector(x,*n,std::abs(*incx)) *= alpha;
126 
127  return 0;
128 }
129 
131 {
132  if(*n<=0) return 0;
133 
134  Scalar* x = reinterpret_cast<Scalar*>(px);
135  Scalar* y = reinterpret_cast<Scalar*>(py);
136 
137  if(*incx==1 && *incy==1) make_vector(y,*n).swap(make_vector(x,*n));
138  else if(*incx>0 && *incy>0) make_vector(y,*n,*incy).swap(make_vector(x,*n,*incx));
139  else if(*incx>0 && *incy<0) make_vector(y,*n,-*incy).reverse().swap(make_vector(x,*n,*incx));
140  else if(*incx<0 && *incy>0) make_vector(y,*n,*incy).swap(make_vector(x,*n,-*incx).reverse());
141  else if(*incx<0 && *incy<0) make_vector(y,*n,-*incy).reverse().swap(make_vector(x,*n,-*incx).reverse());
142 
143  return 1;
144 }
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Definition: gtsam/3rdparty/Eigen/blas/common.h:123
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Definition: gtsam/3rdparty/Eigen/blas/common.h:173
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Definition: level1_impl.h:54
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autogenerated on Fri Nov 1 2024 03:33:06