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1 // f-qr.cc -*- C++ -*- |
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2 /* |
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3 |
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4 Copyright (C) 1993 John W. Eaton |
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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 2, or (at your option) any |
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11 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, write to the Free |
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20 Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. |
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21 |
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22 */ |
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23 |
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24 #ifdef __GNUG__ |
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25 #pragma implementation |
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26 #endif |
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27 |
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28 #include "Matrix.h" |
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29 |
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30 #include "tree-const.h" |
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31 #include "user-prefs.h" |
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32 #include "gripes.h" |
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33 #include "f-qr.h" |
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34 |
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35 #ifdef WITH_DLD |
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36 tree_constant * |
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37 builtin_qr_2 (tree_constant *args, int nargin, int nargout) |
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38 { |
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39 return qr (args[1], nargout); |
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40 } |
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41 #endif |
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42 |
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43 tree_constant * |
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44 qr (tree_constant& a, int nargout) |
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45 { |
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46 tree_constant *retval = new tree_constant [3]; |
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47 |
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48 tree_constant tmp = a.make_numeric ();; |
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49 |
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50 int nr = tmp.rows (); |
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51 int nc = tmp.columns (); |
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52 |
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53 if (nr == 0 || nc == 0) |
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54 { |
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55 int flag = user_pref.propagate_empty_matrices; |
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56 if (flag != 0) |
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57 { |
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58 if (flag < 0) |
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59 gripe_empty_arg ("qr", 0); |
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60 Matrix m; |
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61 retval = new tree_constant [3]; |
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62 retval[0] = tree_constant (m); |
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63 retval[1] = tree_constant (m); |
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64 } |
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65 else |
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66 gripe_empty_arg ("qr", 1); |
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67 |
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68 return retval; |
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69 } |
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70 |
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71 switch (tmp.const_type ()) |
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72 { |
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73 case tree_constant_rep::matrix_constant: |
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74 { |
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75 Matrix m = tmp.matrix_value (); |
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76 QR fact (m); |
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77 retval[0] = tree_constant (fact.Q ()); |
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78 retval[1] = tree_constant (fact.R ()); |
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79 } |
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80 break; |
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81 case tree_constant_rep::complex_matrix_constant: |
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82 { |
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83 ComplexMatrix m = tmp.complex_matrix_value (); |
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84 ComplexQR fact (m); |
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85 retval[0] = tree_constant (fact.Q ()); |
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86 retval[1] = tree_constant (fact.R ()); |
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87 } |
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88 break; |
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89 case tree_constant_rep::scalar_constant: |
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90 { |
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91 double d = tmp.double_value (); |
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92 retval[0] = tree_constant (1.0); |
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93 retval[1] = tree_constant (d); |
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94 } |
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95 break; |
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96 case tree_constant_rep::complex_scalar_constant: |
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97 { |
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98 Complex c = tmp.complex_value (); |
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99 retval[0] = tree_constant (1.0); |
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100 retval[1] = tree_constant (c); |
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101 } |
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102 break; |
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103 default: |
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104 break; |
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105 } |
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106 return retval; |
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107 } |
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108 |
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109 /* |
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110 ;;; Local Variables: *** |
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111 ;;; mode: C++ *** |
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112 ;;; page-delimiter: "^/\\*" *** |
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113 ;;; End: *** |
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114 */ |
