/usr/share/perl5/Statistics/Basic/Mode.pm is in libstatistics-basic-perl 1.6607-1.
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 | package Statistics::Basic::Mode;
use strict;
use warnings;
use Carp;
use Statistics::Basic;
use Scalar::Util qw(blessed);
use base 'Statistics::Basic::_OneVectorBase';
use overload
'""' => sub {
defined( my $q = $_[0]->query ) or return "n/a";
return $q if ref $q; # vectors interpolate themselves
$Statistics::Basic::fmt->format_number($_[0]->query, $Statistics::Basic::IPRES);
},
'0+' => sub {
my $q = $_[0]->query;
croak "result is multimodal and cannot be used as a number" if ref $q;
$q;
},
fallback => 1; # tries to do what it would have done if this wasn't present.
sub new {
my $class = shift;
warn "[new $class]\n" if $Statistics::Basic::DEBUG >= 2;
my $this = bless {}, $class;
my $vector = eval { Statistics::Basic::Vector->new(@_) } or croak $@;
my $c = $vector->_get_computer("mode"); return $c if defined $c;
$this->{v} = $vector;
$vector->_set_computer( mode => $this );
return $this;
}
sub _recalc {
my $this = shift;
my $v = $this->{v};
my $cardinality = $v->query_size;
delete $this->{recalc_needed};
delete $this->{_value};
return unless $cardinality > 0;
return unless $v->query_filled; # only applicable in certain circumstances
my %mode;
my $max = 0;
for my $val ($v->query) {
no warnings 'uninitialized'; ## no critic
my $t = ++ $mode{$val};
$max = $t if $t > $max;
}
my @a = sort {$a<=>$b} grep { $mode{$_}==$max } keys %mode;
$this->{_value} = ( (@a == 1) ? $a[0] : Statistics::Basic::Vector->new(\@a) );
warn "[recalc " . ref($this) . "] count of $this->{_value} = $max\n" if $Statistics::Basic::DEBUG;
return;
}
sub is_multimodal {
my $this = shift;
my $that = $this->query;
return (blessed($that) ? 1:0);
}
1;
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