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1 /* |
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2 |
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3 Copyright (C) 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 #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 "lo-specfun.h" |
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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 (gammainc, args, , |
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36 "gammainc (x, a)\n\ |
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37 \n\ |
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38 Compute the incomplete gamma function\n\ |
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39 \n\ |
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40 gammainc(x,a) = (\\int_0^x exp(-t) t^(a-1) dt) / gamma(a).\n\ |
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41 \n\ |
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42 If a is scalar, then gammainc(x,a) is returned for each element of x\n\ |
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43 and vice versa.\n\ |
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44 \n\ |
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45 If neither a nor x is scalar, the sizes of a and x must agree, and\n\ |
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46 gammainc is applied for corresponding elements of x and a.") |
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47 { |
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48 octave_value retval; |
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49 |
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50 int nargin = args.length (); |
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51 |
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52 if (nargin == 2) |
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53 { |
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54 octave_value x_arg = args(0); |
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55 octave_value a_arg = args(1); |
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56 |
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57 if (x_arg.is_scalar_type ()) |
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58 { |
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59 double x = x_arg.double_value (); |
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60 |
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61 if (! error_state) |
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62 { |
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63 if (a_arg.is_scalar_type ()) |
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64 { |
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65 double a = a_arg.double_value (); |
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66 |
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67 if (! error_state) |
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68 retval = gammainc (x, a); |
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69 } |
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70 else |
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71 { |
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72 Matrix a = a_arg.matrix_value (); |
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73 |
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74 if (! error_state) |
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75 retval = gammainc (x, a); |
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76 } |
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77 } |
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78 } |
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79 else |
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80 { |
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81 Matrix x = x_arg.matrix_value (); |
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82 |
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83 if (! error_state) |
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84 { |
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85 if (a_arg.is_scalar_type ()) |
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86 { |
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87 double a = a_arg.double_value (); |
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88 |
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89 if (! error_state) |
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90 retval = gammainc (x, a); |
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91 } |
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92 else |
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93 { |
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94 Matrix a = a_arg.matrix_value (); |
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95 |
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96 if (! error_state) |
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97 retval = gammainc (x, a); |
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98 } |
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99 } |
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100 } |
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101 } |
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102 else |
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103 print_usage ("gammainc"); |
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104 |
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105 return retval; |
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106 } |
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107 |
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108 /* |
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109 ;;; Local Variables: *** |
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110 ;;; mode: C++ *** |
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111 ;;; End: *** |
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112 */ |
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113 |
