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1 // f-ifft.cc -*- C++ -*- |
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1
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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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240
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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 "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 "error.h" |
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34 #include "f-ifft.h" |
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35 |
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36 #ifdef WITH_DLD |
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37 tree_constant * |
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162
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38 builtin_ifft_2 (const tree_constant *args, int nargin, int nargout) |
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39 { |
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40 tree_constant *retval = new tree_constant [2]; |
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41 retval[0] = ifft (args[1]); |
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42 return retval; |
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43 } |
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44 #endif |
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45 |
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46 tree_constant |
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47 ifft (const tree_constant& a) |
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48 { |
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49 tree_constant retval; |
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50 |
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51 tree_constant tmp = a.make_numeric ();; |
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52 |
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53 if (tmp.rows () == 0 || tmp.columns () == 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 ("ifft", 0); |
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60 Matrix m; |
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61 retval = tree_constant (m); |
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62 } |
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63 else |
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64 gripe_empty_arg ("ifft", 1); |
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65 |
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66 return retval; |
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67 } |
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68 |
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69 switch (tmp.const_type ()) |
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70 { |
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71 case tree_constant_rep::matrix_constant: |
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72 { |
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73 Matrix m = tmp.matrix_value (); |
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74 ComplexMatrix mifft = m.ifourier (); |
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75 retval = tree_constant (mifft); |
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76 } |
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77 break; |
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78 case tree_constant_rep::complex_matrix_constant: |
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79 { |
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80 ComplexMatrix m = tmp.complex_matrix_value (); |
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81 ComplexMatrix mifft = m.ifourier (); |
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82 retval = tree_constant (mifft); |
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83 } |
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84 break; |
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85 case tree_constant_rep::scalar_constant: |
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86 case tree_constant_rep::complex_scalar_constant: |
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87 error ("ifft: invalid scalar arguement"); |
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88 break; |
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89 default: |
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90 panic_impossible (); |
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91 break; |
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92 } |
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93 return retval; |
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94 } |
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95 |
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96 |
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97 /* |
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98 ;;; Local Variables: *** |
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99 ;;; mode: C++ *** |
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100 ;;; page-delimiter: "^/\\*" *** |
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101 ;;; End: *** |
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102 */ |
