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1 /* |
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2 |
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3 Copyright (C) 1996, 1997 John W. Eaton |
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4 |
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5 This file is part of Octave. |
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6 |
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7 Octave is free software; you can redistribute it and/or modify it |
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8 under the terms of the GNU General Public License as published by the |
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9 Free Software Foundation; either version 2, or (at your option) any |
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10 later version. |
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11 |
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12 Octave is distributed in the hope that it will be useful, but WITHOUT |
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13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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15 for more details. |
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16 |
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17 You should have received a copy of the GNU General Public License |
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18 along with Octave; see the file COPYING. If not, write to the Free |
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19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
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20 |
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21 */ |
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22 |
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23 #ifdef HAVE_CONFIG_H |
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24 #include <config.h> |
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25 #endif |
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26 |
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27 #include "CmplxHESS.h" |
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28 #include "dbleHESS.h" |
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29 |
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30 #include "defun-dld.h" |
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31 #include "error.h" |
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32 #include "gripes.h" |
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33 #include "help.h" |
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34 #include "oct-obj.h" |
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35 #include "utils.h" |
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36 |
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37 DEFUN_DLD (hess, args, nargout, |
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38 "[P, H] = hess (A) or H = hess (A): Hessenberg decomposition") |
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39 { |
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40 octave_value_list retval; |
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41 |
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42 int nargin = args.length (); |
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43 |
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44 if (nargin != 1 || nargout > 2) |
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45 { |
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46 print_usage ("hess"); |
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47 return retval; |
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48 } |
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49 |
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50 octave_value arg = args(0); |
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51 |
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52 int nr = arg.rows (); |
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53 int nc = arg.columns (); |
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54 |
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55 int arg_is_empty = empty_arg ("hess", nr, nc); |
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56 |
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57 if (arg_is_empty < 0) |
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58 return retval; |
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59 else if (arg_is_empty > 0) |
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60 return octave_value_list (2, Matrix ()); |
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61 |
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62 if (nr != nc) |
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63 { |
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64 gripe_square_matrix_required ("hess"); |
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65 return retval; |
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66 } |
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67 |
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68 if (arg.is_real_type ()) |
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69 { |
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70 Matrix tmp = arg.matrix_value (); |
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71 |
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72 if (! error_state) |
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73 { |
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74 HESS result (tmp); |
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75 |
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76 if (nargout == 0 || nargout == 1) |
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77 { |
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78 retval.resize (1); |
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79 retval(0) = result.hess_matrix (); |
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80 } |
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81 else |
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82 { |
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83 retval.resize (2); |
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84 retval(0) = result.unitary_hess_matrix (); |
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85 retval(1) = result.hess_matrix (); |
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86 } |
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87 } |
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88 } |
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89 else if (arg.is_complex_type ()) |
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90 { |
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91 ComplexMatrix ctmp = arg.complex_matrix_value (); |
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92 |
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93 if (! error_state) |
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94 { |
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95 ComplexHESS result (ctmp); |
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96 |
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97 if (nargout == 0 || nargout == 1) |
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98 { |
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99 retval.resize (1); |
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100 retval(0) = result.hess_matrix (); |
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101 } |
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102 else |
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103 { |
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104 retval.resize (2); |
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105 retval(0) = result.unitary_hess_matrix (); |
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106 retval(1) = result.hess_matrix (); |
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107 } |
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108 } |
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109 } |
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110 else |
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111 { |
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112 gripe_wrong_type_arg ("hess", arg); |
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113 } |
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114 |
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115 return retval; |
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116 } |
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117 |
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118 /* |
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119 ;;; Local Variables: *** |
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120 ;;; mode: C++ *** |
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121 ;;; End: *** |
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122 */ |
