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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, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
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20 02110-1301, USA. |
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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-specfun.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 DEFUN_DLD (betainc, args, , |
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37 "-*- texinfo -*-\n\ |
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38 @deftypefn {Mapping Function} {} betainc (@var{x}, @var{a}, @var{b})\n\ |
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39 Return the incomplete Beta function,\n\ |
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40 @iftex\n\ |
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41 @tex\n\ |
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42 $$\n\ |
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43 \\beta (x, a, b) = B (a, b)^{-1} \\int_0^x t^{(a-z)} (1-t)^{(b-1)} dt.\n\ |
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44 $$\n\ |
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45 @end tex\n\ |
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46 @end iftex\n\ |
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47 @ifinfo\n\ |
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48 \n\ |
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49 @smallexample\n\ |
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50 x\n\ |
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51 /\n\ |
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52 betainc (x, a, b) = beta (a, b)^(-1) | t^(a-1) (1-t)^(b-1) dt.\n\ |
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53 /\n\ |
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54 t=0\n\ |
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55 @end smallexample\n\ |
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56 @end ifinfo\n\ |
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57 \n\ |
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58 If x has more than one component, both @var{a} and @var{b} must be\n\ |
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59 scalars. If @var{x} is a scalar, @var{a} and @var{b} must be of\n\ |
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60 compatible dimensions.\n\ |
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61 @end deftypefn") |
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62 { |
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63 octave_value retval; |
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64 |
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65 int nargin = args.length (); |
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66 |
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67 if (nargin == 3) |
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68 { |
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69 octave_value x_arg = args(0); |
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70 octave_value a_arg = args(1); |
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71 octave_value b_arg = args(2); |
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72 |
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73 if (x_arg.is_scalar_type ()) |
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74 { |
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75 double x = x_arg.double_value (); |
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76 |
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77 if (a_arg.is_scalar_type ()) |
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78 { |
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79 double a = a_arg.double_value (); |
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80 |
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81 if (! error_state) |
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82 { |
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83 if (b_arg.is_scalar_type ()) |
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84 { |
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85 double b = b_arg.double_value (); |
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86 |
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87 if (! error_state) |
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88 retval = betainc (x, a, b); |
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89 } |
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90 else |
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91 { |
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92 NDArray b = b_arg.array_value (); |
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93 |
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94 if (! error_state) |
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95 retval = betainc (x, a, b); |
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96 } |
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97 } |
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98 } |
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99 else |
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100 { |
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101 NDArray a = a_arg.array_value (); |
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102 |
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103 if (! error_state) |
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104 { |
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105 if (b_arg.is_scalar_type ()) |
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106 { |
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107 double b = b_arg.double_value (); |
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108 |
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109 if (! error_state) |
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110 retval = betainc (x, a, b); |
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111 } |
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112 else |
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113 { |
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114 NDArray b = b_arg.array_value (); |
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115 |
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116 if (! error_state) |
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117 retval = betainc (x, a, b); |
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118 } |
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119 } |
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120 } |
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121 } |
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122 else |
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123 { |
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124 NDArray x = x_arg.array_value (); |
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125 |
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126 if (a_arg.is_scalar_type ()) |
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127 { |
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128 double a = a_arg.double_value (); |
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129 |
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130 if (! error_state) |
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131 { |
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132 if (b_arg.is_scalar_type ()) |
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133 { |
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134 double b = b_arg.double_value (); |
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135 |
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136 if (! error_state) |
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137 retval = betainc (x, a, b); |
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138 } |
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139 else |
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140 { |
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141 NDArray b = b_arg.array_value (); |
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142 |
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143 if (! error_state) |
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144 retval = betainc (x, a, b); |
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145 } |
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146 } |
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147 } |
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148 else |
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149 { |
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150 NDArray a = a_arg.array_value (); |
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151 |
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152 if (! error_state) |
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153 { |
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154 if (b_arg.is_scalar_type ()) |
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155 { |
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156 double b = b_arg.double_value (); |
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157 |
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158 if (! error_state) |
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159 retval = betainc (x, a, b); |
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160 } |
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161 else |
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162 { |
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163 NDArray b = b_arg.array_value (); |
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164 |
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165 if (! error_state) |
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166 retval = betainc (x, a, b); |
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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 } |
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172 else |
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173 print_usage (); |
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174 |
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175 return retval; |
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176 } |
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177 |
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178 /* |
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179 ;;; Local Variables: *** |
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180 ;;; mode: C++ *** |
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181 ;;; End: *** |
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182 */ |
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183 |
