This file is indexed.

/usr/share/octave/packages/statistics-1.3.0/hygestat.m is in octave-statistics 1.3.0-4.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
## Copyright (C) 2006, 2007 Arno Onken <asnelt@asnelt.org>
##
## This program is free software; you can redistribute it and/or modify it under
## the terms of the GNU General Public License as published by the Free Software
## Foundation; either version 3 of the License, or (at your option) any later
## version.
##
## This program is distributed in the hope that it will be useful, but WITHOUT
## ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
## FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
## details.
##
## You should have received a copy of the GNU General Public License along with
## this program; if not, see <http://www.gnu.org/licenses/>.

## -*- texinfo -*-
## @deftypefn {Function File} {[@var{mn}, @var{v}] =} hygestat (@var{t}, @var{m}, @var{n})
## Compute mean and variance of the hypergeometric distribution.
##
## @subheading Arguments
##
## @itemize @bullet
## @item
## @var{t} is the total size of the population of the hypergeometric
## distribution. The elements of @var{t} must be positive natural numbers
##
## @item
## @var{m} is the number of marked items of the hypergeometric distribution.
## The elements of @var{m} must be natural numbers
##
## @item
## @var{n} is the size of the drawn sample of the hypergeometric
## distribution. The elements of @var{n} must be positive natural numbers
## @end itemize
## @var{t}, @var{m}, and @var{n} must be of common size or scalar
##
## @subheading Return values
##
## @itemize @bullet
## @item
## @var{mn} is the mean of the hypergeometric distribution
##
## @item
## @var{v} is the variance of the hypergeometric distribution
## @end itemize
##
## @subheading Examples
##
## @example
## @group
## t = 4:9;
## m = 0:5;
## n = 1:6;
## [mn, v] = hygestat (t, m, n)
## @end group
##
## @group
## [mn, v] = hygestat (t, m, 2)
## @end group
## @end example
##
## @subheading References
##
## @enumerate
## @item
## Wendy L. Martinez and Angel R. Martinez. @cite{Computational Statistics
## Handbook with MATLAB}. Appendix E, pages 547-557, Chapman & Hall/CRC,
## 2001.
##
## @item
## Athanasios Papoulis. @cite{Probability, Random Variables, and Stochastic
## Processes}. McGraw-Hill, New York, second edition, 1984.
## @end enumerate
## @end deftypefn

## Author: Arno Onken <asnelt@asnelt.org>
## Description: Moments of the hypergeometric distribution

function [mn, v] = hygestat (t, m, n)

  # Check arguments
  if (nargin != 3)
    print_usage ();
  endif

  if (! isempty (t) && ! ismatrix (t))
    error ("hygestat: t must be a numeric matrix");
  endif
  if (! isempty (m) && ! ismatrix (m))
    error ("hygestat: m must be a numeric matrix");
  endif
  if (! isempty (n) && ! ismatrix (n))
    error ("hygestat: n must be a numeric matrix");
  endif

  if (! isscalar (t) || ! isscalar (m) || ! isscalar (n))
    [retval, t, m, n] = common_size (t, m, n);
    if (retval > 0)
      error ("hygestat: t, m and n must be of common size or scalar");
    endif
  endif

  # Calculate moments
  mn = (n .* m) ./ t;
  v = (n .* (m ./ t) .* (1 - m ./ t) .* (t - n)) ./ (t - 1);

  # Continue argument check
  k = find (! (t >= 0) | ! (m >= 0) | ! (n > 0) | ! (t == round (t)) | ! (m == round (m)) | ! (n == round (n)) | ! (m <= t) | ! (n <= t));
  if (any (k))
    mn(k) = NaN;
    v(k) = NaN;
  endif

endfunction

%!test
%! t = 4:9;
%! m = 0:5;
%! n = 1:6;
%! [mn, v] = hygestat (t, m, n);
%! expected_mn = [0.0000, 0.4000, 1.0000, 1.7143, 2.5000, 3.3333];
%! expected_v = [0.0000, 0.2400, 0.4000, 0.4898, 0.5357, 0.5556];
%! assert (mn, expected_mn, 0.001);
%! assert (v, expected_v, 0.001);

%!test
%! t = 4:9;
%! m = 0:5;
%! [mn, v] = hygestat (t, m, 2);
%! expected_mn = [0.0000, 0.4000, 0.6667, 0.8571, 1.0000, 1.1111];
%! expected_v = [0.0000, 0.2400, 0.3556, 0.4082, 0.4286, 0.4321];
%! assert (mn, expected_mn, 0.001);
%! assert (v, expected_v, 0.001);