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1 // f-ifft.cc -*- C++ -*- |
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2 /* |
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3 |
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4 Copyright (C) 1993, 1994 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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453
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28 #include "dMatrix.h" |
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29 #include "CMatrix.h" |
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30 |
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31 #include "tree-const.h" |
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32 #include "user-prefs.h" |
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33 #include "gripes.h" |
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34 #include "error.h" |
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35 #include "defun-dld.h" |
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36 |
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37 DEFUN_DLD ("ifft", Fifft, Sifft,2, 1, |
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38 "ifft (X): inverse fast fourier transform of a vector") |
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39 { |
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40 Octave_object retval; |
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41 |
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42 int nargin = args.length (); |
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43 |
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519
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44 if (nargin != 2) |
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45 { |
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46 print_usage ("ifft"); |
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47 return retval; |
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48 } |
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49 |
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50 tree_constant tmp = args(1).make_numeric (); |
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51 |
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52 if (tmp.rows () == 0 || tmp.columns () == 0) |
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53 { |
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54 int flag = user_pref.propagate_empty_matrices; |
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55 if (flag != 0) |
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56 { |
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57 if (flag < 0) |
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58 gripe_empty_arg ("ifft", 0); |
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59 |
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60 retval.resize (1, Matrix ()); |
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61 } |
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62 else |
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63 gripe_empty_arg ("ifft", 1); |
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64 |
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65 return retval; |
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66 } |
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67 |
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68 switch (tmp.const_type ()) |
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69 { |
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70 case tree_constant_rep::matrix_constant: |
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71 { |
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72 Matrix m = tmp.matrix_value (); |
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73 ComplexMatrix mifft = m.ifourier (); |
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74 retval = mifft; |
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75 } |
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76 break; |
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77 case tree_constant_rep::complex_matrix_constant: |
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78 { |
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79 ComplexMatrix m = tmp.complex_matrix_value (); |
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80 ComplexMatrix mifft = m.ifourier (); |
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81 retval = mifft; |
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82 } |
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83 break; |
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84 case tree_constant_rep::scalar_constant: |
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85 case tree_constant_rep::complex_scalar_constant: |
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86 error ("ifft: invalid scalar arguement"); |
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87 break; |
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88 default: |
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89 panic_impossible (); |
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90 break; |
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91 } |
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92 return retval; |
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93 } |
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94 |
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95 /* |
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96 ;;; Local Variables: *** |
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97 ;;; mode: C++ *** |
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98 ;;; page-delimiter: "^/\\*" *** |
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99 ;;; End: *** |
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100 */ |
