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1 /* |
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2 |
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3 Copyright (C) 1996 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 "defun-dld.h" |
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28 #include "error.h" |
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29 #include "gripes.h" |
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30 #include "help.h" |
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31 #include "mappers.h" |
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32 #include "oct-obj.h" |
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33 #include "user-prefs.h" |
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34 #include "utils.h" |
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35 |
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36 // This function should be merged with Ffft2. |
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37 |
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38 DEFUN_DLD_BUILTIN (ifft2, args, , |
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39 "ifft2 (X [, N] [, M])\n\ |
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40 \n\ |
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41 two dimensional inverse fast fourier transform of a vector") |
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42 { |
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43 Octave_object retval; |
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44 |
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45 int nargin = args.length (); |
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46 |
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47 if (nargin < 1 || nargin > 3) |
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48 { |
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49 print_usage ("ifft2"); |
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50 return retval; |
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51 } |
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52 |
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53 tree_constant arg = args(0); |
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54 |
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55 int n_rows = arg.rows (); |
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56 if (nargin > 1) |
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57 { |
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58 double dval = args(1).double_value (); |
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59 if (xisnan (dval)) |
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60 error ("fft2: NaN is invalid as N_ROWS"); |
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61 else |
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62 n_rows = NINT (dval); |
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63 } |
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64 |
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65 if (error_state) |
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66 return retval; |
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67 |
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68 int n_cols = arg.columns (); |
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69 if (nargin > 2) |
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70 { |
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71 double dval = args(2).double_value (); |
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72 if (xisnan (dval)) |
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73 error ("fft2: NaN is invalid as N_COLS"); |
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74 else |
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75 n_cols = NINT (dval); |
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76 } |
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77 |
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78 if (error_state) |
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79 return retval; |
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80 |
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81 if (n_rows < 0 || n_cols < 0) |
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82 { |
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83 error ("ifft2: number of points must be greater than zero"); |
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84 return retval; |
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85 } |
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86 |
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87 int arg_is_empty = empty_arg ("ifft2", arg.rows (), arg.columns ()); |
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88 |
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89 if (arg_is_empty < 0) |
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90 return retval; |
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91 else if (arg_is_empty || n_rows == 0 || n_cols == 0) |
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92 return Matrix (); |
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93 |
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94 if (arg.is_real_type ()) |
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95 { |
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96 Matrix m = arg.matrix_value (); |
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97 |
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98 if (! error_state) |
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99 { |
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100 m.resize (n_rows, n_cols, 0.0); |
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101 retval = m.ifourier2d (); |
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102 } |
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103 } |
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104 else if (arg.is_complex_type ()) |
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105 { |
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106 ComplexMatrix m = arg.complex_matrix_value (); |
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107 |
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108 if (! error_state) |
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109 { |
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110 m.resize (n_rows, n_cols, 0.0); |
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111 retval = m.ifourier2d (); |
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112 } |
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113 } |
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114 else |
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115 { |
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116 gripe_wrong_type_arg ("ifft2", arg); |
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117 } |
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118 |
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119 return retval; |
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120 } |
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121 |
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122 /* |
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123 ;;; Local Variables: *** |
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124 ;;; mode: C++ *** |
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125 ;;; End: *** |
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126 */ |
