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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 (betainc, args, , |
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36 "betainc (x, a, b)\n\ |
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37 \n\ |
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38 Compute the incomplete beta function\n\ |
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39 \n\ |
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40 betainc(x,a,b) = beta(a,b)^(-1) \\int_0^x t^(a-1) (1-t)^(b-1) dt\n\ |
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41 \n\ |
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42 The sizes of x, a, and b must agree.") |
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43 { |
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44 octave_value retval; |
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45 |
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46 int nargin = args.length (); |
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47 |
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48 if (nargin == 3) |
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49 { |
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50 octave_value x_arg = args(0); |
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51 octave_value a_arg = args(1); |
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52 octave_value b_arg = args(2); |
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53 |
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54 if (x_arg.is_scalar_type ()) |
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55 { |
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56 double x = x_arg.double_value (); |
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57 |
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58 if (a_arg.is_scalar_type ()) |
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59 { |
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60 double a = a_arg.double_value (); |
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61 |
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62 if (! error_state) |
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63 { |
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64 if (b_arg.is_scalar_type ()) |
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65 { |
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66 double b = b_arg.double_value (); |
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67 |
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68 if (! error_state) |
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69 retval = betainc (x, a, b); |
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70 } |
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71 else |
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72 { |
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73 Matrix b = b_arg.matrix_value (); |
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74 |
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75 if (! error_state) |
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76 retval = betainc (x, a, b); |
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77 } |
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78 } |
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79 } |
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80 else |
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81 { |
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82 Matrix a = a_arg.matrix_value (); |
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83 |
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84 if (! error_state) |
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85 { |
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86 if (b_arg.is_scalar_type ()) |
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87 { |
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88 double b = b_arg.double_value (); |
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89 |
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90 if (! error_state) |
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91 retval = betainc (x, a, b); |
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92 } |
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93 else |
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94 { |
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95 Matrix b = b_arg.matrix_value (); |
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96 |
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97 if (! error_state) |
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98 retval = betainc (x, a, b); |
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99 } |
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100 } |
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101 } |
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102 } |
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103 else |
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104 { |
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105 Matrix x = x_arg.matrix_value (); |
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106 |
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107 if (a_arg.is_scalar_type ()) |
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108 { |
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109 double a = a_arg.double_value (); |
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110 |
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111 if (! error_state) |
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112 { |
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113 if (b_arg.is_scalar_type ()) |
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114 { |
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115 double b = b_arg.double_value (); |
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116 |
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117 if (! error_state) |
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118 retval = betainc (x, a, b); |
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119 } |
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120 else |
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121 { |
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122 Matrix b = b_arg.matrix_value (); |
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123 |
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124 if (! error_state) |
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125 retval = betainc (x, a, b); |
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126 } |
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127 } |
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128 } |
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129 else |
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130 { |
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131 Matrix a = a_arg.matrix_value (); |
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132 |
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133 if (! error_state) |
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134 { |
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135 if (b_arg.is_scalar_type ()) |
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136 { |
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137 double b = b_arg.double_value (); |
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138 |
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139 if (! error_state) |
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140 retval = betainc (x, a, b); |
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141 } |
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142 else |
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143 { |
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144 Matrix b = b_arg.matrix_value (); |
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145 |
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146 if (! error_state) |
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147 retval = betainc (x, a, b); |
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148 } |
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149 } |
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150 } |
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151 } |
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152 } |
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153 else |
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154 print_usage ("betainc"); |
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155 |
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156 return retval; |
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157 } |
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158 |
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159 /* |
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160 ;;; Local Variables: *** |
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161 ;;; mode: C++ *** |
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162 ;;; End: *** |
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163 */ |
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164 |
