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1 /* |
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2 |
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3 Copyright (C) 2004 David Bateman |
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4 Copyright (C) 1996, 1997 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 3 of the License, or (at your |
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11 option) any 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, see |
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20 <http://www.gnu.org/licenses/>. |
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21 |
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22 */ |
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23 |
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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 "lo-mappers.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 "oct-obj.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 Fifft. |
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37 |
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38 #if defined (HAVE_FFTW3) |
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39 #define FFTSRC "@sc{Fftw}" |
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40 #else |
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41 #define FFTSRC "@sc{Fftpack}" |
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42 #endif |
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43 |
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44 static octave_value |
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45 do_fft2 (const octave_value_list &args, const char *fcn, int type) |
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46 { |
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47 octave_value retval; |
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48 |
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49 int nargin = args.length (); |
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50 |
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51 if (nargin < 1 || nargin > 3) |
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52 { |
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53 print_usage (); |
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54 return retval; |
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55 } |
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56 |
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57 octave_value arg = args(0); |
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58 dim_vector dims = arg.dims (); |
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59 octave_idx_type n_rows = -1; |
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60 |
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61 if (nargin > 1) |
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62 { |
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63 double dval = args(1).double_value (); |
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64 if (xisnan (dval)) |
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65 error ("%s: NaN is invalid as the N_ROWS", fcn); |
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66 else |
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67 { |
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68 n_rows = NINTbig (dval); |
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69 if (n_rows < 0) |
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70 error ("%s: number of rows must be greater than zero", fcn); |
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71 } |
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72 } |
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73 |
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74 if (error_state) |
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75 return retval; |
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76 |
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77 octave_idx_type n_cols = -1; |
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78 if (nargin > 2) |
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79 { |
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80 double dval = args(2).double_value (); |
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81 if (xisnan (dval)) |
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82 error ("%s: NaN is invalid as the N_COLS", fcn); |
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83 else |
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84 { |
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85 n_cols = NINTbig (dval); |
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86 if (n_cols < 0) |
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87 error ("%s: number of columns must be greater than zero", fcn); |
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88 } |
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89 } |
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90 |
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91 if (error_state) |
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92 return retval; |
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93 |
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94 for (int i = 0; i < dims.length (); i++) |
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95 if (dims(i) < 0) |
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96 return retval; |
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97 |
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98 if (n_rows < 0) |
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99 n_rows = dims (0); |
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100 else |
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101 dims (0) = n_rows; |
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102 |
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103 if (n_cols < 0) |
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104 n_cols = dims (1); |
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105 else |
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106 dims (1) = n_cols; |
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107 |
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108 if (dims.all_zero () || n_rows == 0 || n_cols == 0) |
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109 return octave_value (Matrix ()); |
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110 |
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111 if (arg.is_real_type ()) |
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112 { |
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113 NDArray nda = arg.array_value (); |
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114 |
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115 if (! error_state) |
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116 { |
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117 nda.resize (dims, 0.0); |
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118 retval = (type != 0 ? nda.ifourier2d () : nda.fourier2d ()); |
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119 } |
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120 } |
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121 else if (arg.is_complex_type ()) |
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122 { |
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123 ComplexNDArray cnda = arg.complex_array_value (); |
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124 |
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125 if (! error_state) |
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126 { |
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127 cnda.resize (dims, 0.0); |
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128 retval = (type != 0 ? cnda.ifourier2d () : cnda.fourier2d ()); |
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129 } |
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130 } |
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131 else |
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132 { |
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133 gripe_wrong_type_arg (fcn, arg); |
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134 } |
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135 |
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136 return retval; |
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137 } |
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138 |
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139 DEFUN_DLD (fft2, args, , |
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140 "-*- texinfo -*-\n\ |
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141 @deftypefn {Loadable Function} {} fft2 (@var{a}, @var{n}, @var{m})\n\ |
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142 Compute the two dimensional FFT of @var{a} using subroutines from\n" |
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143 FFTSRC |
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144 ". The optional arguments @var{n} and @var{m} may be used specify the\n\ |
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145 number of rows and columns of @var{a} to use. If either of these is\n\ |
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146 larger than the size of @var{a}, @var{a} is resized and padded with\n\ |
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147 zeros.\n\ |
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148 \n\ |
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149 If @var{a} is a multi-dimensional matrix, each two-dimensional sub-matrix\n\ |
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150 of @var{a} is treated separately\n\ |
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151 @seealso {ifft2, fft, fftn, fftw}\n\ |
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152 @end deftypefn") |
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153 { |
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154 return do_fft2 (args, "fft2", 0); |
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155 } |
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156 |
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157 |
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158 DEFUN_DLD (ifft2, args, , |
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159 "-*- texinfo -*-\n\ |
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160 @deftypefn {Loadable Function} {} fft2 (@var{a}, @var{n}, @var{m})\n\ |
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161 Compute the inverse two dimensional FFT of @var{a} using subroutines from\n" |
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162 FFTSRC |
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163 ". The optional arguments @var{n} and @var{m} may be used specify the\n\ |
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164 number of rows and columns of @var{a} to use. If either of these is\n\ |
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165 larger than the size of @var{a}, @var{a} is resized and padded with\n\ |
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166 zeros.\n\ |
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167 \n\ |
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168 If @var{a} is a multi-dimensional matrix, each two-dimensional sub-matrix\n\ |
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169 of @var{a} is treated separately\n\ |
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170 @seealso {fft2, ifft, ifftn, fftw}\n\ |
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171 @end deftypefn") |
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172 { |
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173 return do_fft2 (args, "ifft2", 1); |
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174 } |
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175 |
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176 /* |
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177 ;;; Local Variables: *** |
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178 ;;; mode: C++ *** |
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179 ;;; End: *** |
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180 */ |
