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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 3 of the License, or (at your |
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10 option) any 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, see |
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19 <http://www.gnu.org/licenses/>. |
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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 "-*- texinfo -*-\n\ |
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37 @deftypefn {Mapping Function} {} betainc (@var{x}, @var{a}, @var{b})\n\ |
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38 Return the incomplete Beta function,\n\ |
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39 @iftex\n\ |
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40 @tex\n\ |
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41 $$\n\ |
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42 \\beta (x, a, b) = B (a, b)^{-1} \\int_0^x t^{(a-z)} (1-t)^{(b-1)} dt.\n\ |
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43 $$\n\ |
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44 @end tex\n\ |
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45 @end iftex\n\ |
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46 @ifinfo\n\ |
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47 \n\ |
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48 @smallexample\n\ |
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49 x\n\ |
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50 /\n\ |
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51 betainc (x, a, b) = beta (a, b)^(-1) | t^(a-1) (1-t)^(b-1) dt.\n\ |
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52 /\n\ |
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53 t=0\n\ |
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54 @end smallexample\n\ |
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55 @end ifinfo\n\ |
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56 \n\ |
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57 If x has more than one component, both @var{a} and @var{b} must be\n\ |
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58 scalars. If @var{x} is a scalar, @var{a} and @var{b} must be of\n\ |
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59 compatible dimensions.\n\ |
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60 @end deftypefn") |
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61 { |
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62 octave_value retval; |
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63 |
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64 int nargin = args.length (); |
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65 |
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66 if (nargin == 3) |
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67 { |
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68 octave_value x_arg = args(0); |
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69 octave_value a_arg = args(1); |
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70 octave_value b_arg = args(2); |
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71 |
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72 if (x_arg.is_scalar_type ()) |
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73 { |
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74 double x = x_arg.double_value (); |
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75 |
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76 if (a_arg.is_scalar_type ()) |
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77 { |
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78 double a = a_arg.double_value (); |
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79 |
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80 if (! error_state) |
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81 { |
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82 if (b_arg.is_scalar_type ()) |
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83 { |
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84 double b = b_arg.double_value (); |
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85 |
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86 if (! error_state) |
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87 retval = betainc (x, a, b); |
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88 } |
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89 else |
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90 { |
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91 NDArray b = b_arg.array_value (); |
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92 |
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93 if (! error_state) |
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94 retval = betainc (x, a, b); |
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95 } |
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96 } |
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97 } |
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98 else |
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99 { |
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100 NDArray a = a_arg.array_value (); |
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101 |
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102 if (! error_state) |
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103 { |
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104 if (b_arg.is_scalar_type ()) |
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105 { |
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106 double b = b_arg.double_value (); |
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107 |
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108 if (! error_state) |
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109 retval = betainc (x, a, b); |
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110 } |
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111 else |
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112 { |
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113 NDArray b = b_arg.array_value (); |
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114 |
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115 if (! error_state) |
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116 retval = betainc (x, a, b); |
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117 } |
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118 } |
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119 } |
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120 } |
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121 else |
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122 { |
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123 NDArray x = x_arg.array_value (); |
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124 |
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125 if (a_arg.is_scalar_type ()) |
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126 { |
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127 double a = a_arg.double_value (); |
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128 |
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129 if (! error_state) |
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130 { |
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131 if (b_arg.is_scalar_type ()) |
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132 { |
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133 double b = b_arg.double_value (); |
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134 |
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135 if (! error_state) |
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136 retval = betainc (x, a, b); |
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137 } |
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138 else |
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139 { |
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140 NDArray b = b_arg.array_value (); |
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141 |
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142 if (! error_state) |
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143 retval = betainc (x, a, b); |
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144 } |
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145 } |
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146 } |
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147 else |
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148 { |
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149 NDArray a = a_arg.array_value (); |
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150 |
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151 if (! error_state) |
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152 { |
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153 if (b_arg.is_scalar_type ()) |
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154 { |
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155 double b = b_arg.double_value (); |
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156 |
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157 if (! error_state) |
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158 retval = betainc (x, a, b); |
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159 } |
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160 else |
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161 { |
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162 NDArray b = b_arg.array_value (); |
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163 |
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164 if (! error_state) |
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165 retval = betainc (x, a, b); |
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166 } |
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167 } |
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168 } |
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169 } |
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170 } |
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171 else |
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172 print_usage (); |
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173 |
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174 return retval; |
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175 } |
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176 |
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177 /* |
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178 ;;; Local Variables: *** |
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179 ;;; mode: C++ *** |
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180 ;;; End: *** |
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181 */ |
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182 |
