annotate libinterp/corefcn/__pchip_deriv__.cc @ 19908:5261186f1b00

__pchip_deriv__.cc: Stop variable might be clobbered by 'longjmp' warning. * __pchip_deriv__.cc: Declare loop index i to be volatile.
author Rik <rik@octave.org>
date Fri, 27 Feb 2015 15:53:42 -0800
parents 4ae2987c5f66
children a9574e3c6e9e
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1 /*
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2
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3 Copyright (C) 2002-2015 Kai Habel
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4 Copyright (C) 2008-2009 Jaroslav Hajek
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5
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6 This file is part of Octave.
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7
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8 Octave is free software; you can redistribute it and/or modify it
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9 under the terms of the GNU General Public License as published by the
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10 Free Software Foundation; either version 3 of the License, or (at your
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11 option) any later version.
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12
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13 Octave is distributed in the hope that it will be useful, but WITHOUT
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14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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16 for more details.
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17
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18 You should have received a copy of the GNU General Public License
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19 along with Octave; see the file COPYING. If not, see
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20 <http://www.gnu.org/licenses/>.
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21
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22 */
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23
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24 #ifdef HAVE_CONFIG_H
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25 #include <config.h>
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26 #endif
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27
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28 #include "defun.h"
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29 #include "error.h"
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30 #include "gripes.h"
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31 #include "oct-obj.h"
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32 #include "utils.h"
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33 #include "f77-fcn.h"
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34
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35 extern "C"
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36 {
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37 F77_RET_T
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38 F77_FUNC (dpchim, DPCHIM) (const octave_idx_type& n, const double *x,
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39 const double *f, double *d,
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40 const octave_idx_type &incfd,
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41 octave_idx_type *ierr);
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42
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43 F77_RET_T
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44 F77_FUNC (pchim, PCHIM) (const octave_idx_type& n, const float *x,
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45 const float *f, float *d,
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46 const octave_idx_type& incfd,
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47 octave_idx_type *ierr);
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48 }
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49
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50 // Wrapper for SLATEC/PCHIP function DPCHIM to calculate the derivates
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51 // for piecewise polynomials.
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52
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53 DEFUN (__pchip_deriv__, args, ,
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54 "-*- texinfo -*-\n\
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55 @deftypefn {Built-in Function} {} __pchip_deriv__ (@var{x}, @var{y}, @var{dim})\n\
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56 Undocumented internal function.\n\
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57 @end deftypefn")
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58 {
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59 octave_value retval;
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60 const int nargin = args.length ();
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61
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62 bool rows = (nargin == 3 && args(2).uint_value () == 2);
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63
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64 if (nargin >= 2)
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65 {
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66 if (args(0).is_single_type () || args(1).is_single_type ())
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67 {
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68 FloatColumnVector xvec (args(0).float_vector_value ());
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69 FloatMatrix ymat (args(1).float_matrix_value ());
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70
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71 octave_idx_type nx = xvec.length ();
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72
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73 if (nx < 2)
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74 {
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75 error ("__pchip_deriv__: X must be at least of length 2");
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76 return retval;
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77 }
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78
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79 octave_idx_type nyr = ymat.rows ();
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80 octave_idx_type nyc = ymat.columns ();
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81
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82 if (nx != (rows ? nyc : nyr))
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83 {
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84 error ("__pchip_deriv__: X and Y dimension mismatch");
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85 return retval;
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86 }
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87
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88 FloatMatrix dmat (nyr, nyc);
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89
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90 octave_idx_type ierr;
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91 const octave_idx_type incfd = rows ? nyr : 1;
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92 volatile const octave_idx_type inc = rows ? 1 : nyr;
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93 volatile octave_idx_type k = 0;
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94
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95 for (volatile octave_idx_type i = (rows ? nyr : nyc); i > 0; i--)
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96 {
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97 F77_XFCN (pchim, PCHIM, (nx, xvec.data (),
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98 ymat.data () + k * inc,
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99 dmat.fortran_vec () + k * inc,
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100 incfd, &ierr));
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101
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102 k++;
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103
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104 if (ierr < 0)
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105 {
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106 error ("__pchip_deriv__: PCHIM failed with ierr = %i", ierr);
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107 return retval;
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108 }
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109 }
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110
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111 retval = dmat;
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112 }
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113 else
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114 {
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115 ColumnVector xvec (args(0).vector_value ());
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116 Matrix ymat (args(1).matrix_value ());
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117
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118 octave_idx_type nx = xvec.length ();
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119
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120 if (nx < 2)
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121 {
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122 error ("__pchip_deriv__: X must be at least of length 2");
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123 return retval;
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124 }
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125
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126 octave_idx_type nyr = ymat.rows ();
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127 octave_idx_type nyc = ymat.columns ();
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128
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129 if (nx != (rows ? nyc : nyr))
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130 {
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131 error ("__pchip_deriv__: X and Y dimension mismatch");
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132 return retval;
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133 }
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134
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135 Matrix dmat (nyr, nyc);
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136
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137 octave_idx_type ierr;
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138 const octave_idx_type incfd = rows ? nyr : 1;
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John W. Eaton <jwe@octave.org>
parents: 19814
diff changeset
139 volatile const octave_idx_type inc = rows ? 1 : nyr;
4ae2987c5f66 avoid variable possibly clobbered by longjmp warning from GCC
John W. Eaton <jwe@octave.org>
parents: 19814
diff changeset
140 volatile octave_idx_type k = 0;
8712
010e15c7be9a support pchip method in interp2
Jaroslav Hajek <highegg@gmail.com>
parents: 7789
diff changeset
141
19908
5261186f1b00 __pchip_deriv__.cc: Stop variable might be clobbered by 'longjmp' warning.
Rik <rik@octave.org>
parents: 19821
diff changeset
142 for (volatile octave_idx_type i = (rows ? nyr : nyc); i > 0; i--)
10154
40dfc0c99116 DLD-FUNCTIONS/*.cc: untabify
John W. Eaton <jwe@octave.org>
parents: 8713
diff changeset
143 {
18637
e7369c43ebe0 Fix segmentation fault for interp2 and pchip method (bug #41838).
Stefan Mahr <dac922@gmx.de>
parents: 17787
diff changeset
144 F77_XFCN (dpchim, DPCHIM, (nx, xvec.data (),
19821
4ae2987c5f66 avoid variable possibly clobbered by longjmp warning from GCC
John W. Eaton <jwe@octave.org>
parents: 19814
diff changeset
145 ymat.data () + k * inc,
4ae2987c5f66 avoid variable possibly clobbered by longjmp warning from GCC
John W. Eaton <jwe@octave.org>
parents: 19814
diff changeset
146 dmat.fortran_vec () + k * inc,
4ae2987c5f66 avoid variable possibly clobbered by longjmp warning from GCC
John W. Eaton <jwe@octave.org>
parents: 19814
diff changeset
147 incfd, &ierr));
4ae2987c5f66 avoid variable possibly clobbered by longjmp warning from GCC
John W. Eaton <jwe@octave.org>
parents: 19814
diff changeset
148 k++;
5838
376e02b2ce70 [project @ 2006-06-01 20:23:53 by jwe]
jwe
parents: 5837
diff changeset
149
10154
40dfc0c99116 DLD-FUNCTIONS/*.cc: untabify
John W. Eaton <jwe@octave.org>
parents: 8713
diff changeset
150 if (ierr < 0)
40dfc0c99116 DLD-FUNCTIONS/*.cc: untabify
John W. Eaton <jwe@octave.org>
parents: 8713
diff changeset
151 {
19814
fc789d4e362e don't suppress stack trace in error message from __pchip_deriv__
John W. Eaton <jwe@octave.org>
parents: 19731
diff changeset
152 error ("__pchip_deriv__: DPCHIM failed with ierr = %i", ierr);
10154
40dfc0c99116 DLD-FUNCTIONS/*.cc: untabify
John W. Eaton <jwe@octave.org>
parents: 8713
diff changeset
153 return retval;
40dfc0c99116 DLD-FUNCTIONS/*.cc: untabify
John W. Eaton <jwe@octave.org>
parents: 8713
diff changeset
154 }
40dfc0c99116 DLD-FUNCTIONS/*.cc: untabify
John W. Eaton <jwe@octave.org>
parents: 8713
diff changeset
155 }
7789
82be108cc558 First attempt at single precision tyeps
David Bateman <dbateman@free.fr>
parents: 7017
diff changeset
156
10154
40dfc0c99116 DLD-FUNCTIONS/*.cc: untabify
John W. Eaton <jwe@octave.org>
parents: 8713
diff changeset
157 retval = dmat;
40dfc0c99116 DLD-FUNCTIONS/*.cc: untabify
John W. Eaton <jwe@octave.org>
parents: 8713
diff changeset
158 }
5837
55404f3b0da1 [project @ 2006-06-01 19:05:31 by jwe]
jwe
parents:
diff changeset
159 }
55404f3b0da1 [project @ 2006-06-01 19:05:31 by jwe]
jwe
parents:
diff changeset
160
55404f3b0da1 [project @ 2006-06-01 19:05:31 by jwe]
jwe
parents:
diff changeset
161 return retval;
55404f3b0da1 [project @ 2006-06-01 19:05:31 by jwe]
jwe
parents:
diff changeset
162 }
12805
3641167e5b75 codesprint: *.cc helper functions do not need tests
Rik <octave@nomad.inbox5.com>
parents: 11586
diff changeset
163
3641167e5b75 codesprint: *.cc helper functions do not need tests
Rik <octave@nomad.inbox5.com>
parents: 11586
diff changeset
164 /*
3641167e5b75 codesprint: *.cc helper functions do not need tests
Rik <octave@nomad.inbox5.com>
parents: 11586
diff changeset
165 ## No test needed for internal helper function.
3641167e5b75 codesprint: *.cc helper functions do not need tests
Rik <octave@nomad.inbox5.com>
parents: 11586
diff changeset
166 %!assert (1)
3641167e5b75 codesprint: *.cc helper functions do not need tests
Rik <octave@nomad.inbox5.com>
parents: 11586
diff changeset
167 */