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1 /* |
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2 |
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3 Copyright (C) 1996, 1997 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 // Written by A. S. Hodel <scotte@eng.auburn.edu> |
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24 |
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25 #ifdef HAVE_CONFIG_H |
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26 #include <config.h> |
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27 #endif |
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28 |
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29 #include "defun-dld.h" |
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30 #include "error.h" |
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31 #include "gripes.h" |
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32 #include "oct-obj.h" |
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33 #include "utils.h" |
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34 |
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35 DEFUN_DLD (expm, args, , |
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36 "expm (X): matrix exponential, e^A") |
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37 { |
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38 octave_value_list retval; |
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39 |
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40 int nargin = args.length (); |
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41 |
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42 if (nargin != 1) |
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43 { |
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44 print_usage ("expm"); |
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45 return retval; |
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46 } |
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47 |
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48 octave_value arg = args(0); |
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49 |
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50 int nr = arg.rows (); |
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51 int nc = arg.columns (); |
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52 |
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53 int arg_is_empty = empty_arg ("expm", nr, nc); |
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54 |
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55 if (arg_is_empty < 0) |
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56 return retval; |
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57 if (arg_is_empty > 0) |
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58 return Matrix (); |
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59 |
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60 if (nr != nc) |
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61 { |
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62 gripe_square_matrix_required ("expm"); |
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63 return retval; |
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64 } |
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65 |
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66 if (arg.is_real_type ()) |
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67 { |
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68 Matrix m = arg.matrix_value (); |
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69 |
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70 if (error_state) |
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71 return retval; |
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72 else |
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73 retval = m.expm (); |
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74 } |
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75 else if (arg.is_complex_type ()) |
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76 { |
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77 ComplexMatrix m = arg.complex_matrix_value (); |
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78 |
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79 if (error_state) |
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80 return retval; |
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81 else |
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82 retval = m.expm (); |
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83 } |
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84 else |
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85 { |
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86 gripe_wrong_type_arg ("expm", arg); |
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87 } |
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88 |
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89 return retval; |
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90 } |
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91 |
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92 /* |
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93 ;;; Local Variables: *** |
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94 ;;; mode: C++ *** |
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95 ;;; End: *** |
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96 */ |
