File: | lib/App/plackbench/Stats.pm |
Coverage: | 100.0% |
line | stmt | bran | cond | sub | time | code |
---|---|---|---|---|---|---|
1 | package App::plackbench::Stats; | |||||
2 | ||||||
3 | 6 6 6 | 32 13 226 | use strict; | |||
4 | 6 6 6 | 34 12 176 | use warnings; | |||
5 | 6 6 6 | 293 16909 37 | use autodie; | |||
6 | 6 6 6 | 29508 39 319 | use v5.10; | |||
7 | ||||||
8 | 6 6 6 | 36 13 4988 | use List::Util qw( sum reduce ); | |||
9 | ||||||
10 | sub new { | |||||
11 | 28 | 72 | my $class = shift; | |||
12 | 28 71 | 97 152 | my @self = sort { $a <=> $b } @_; | |||
13 | 28 | 221 | return bless \@self, $class; | |||
14 | } | |||||
15 | ||||||
16 | sub insert { | |||||
17 | 44 | 101 | my $self = shift; | |||
18 | 44 | 81 | my $n = shift; | |||
19 | ||||||
20 | 44 | 118 | my $index = $self->count(); | |||
21 | ||||||
22 | 44 | 127 | for (my $i = 0; $i < $self->count(); $i++) { | |||
23 | 74 | 242 | if ($n < $self->[$i]) { | |||
24 | 33 | 62 | $index = $i; | |||
25 | 33 | 74 | last; | |||
26 | } | |||||
27 | } | |||||
28 | ||||||
29 | 44 44 | 90 123 | splice(@{$self}, $index, 0, $n); | |||
30 | ||||||
31 | 44 | 117 | return $index; | |||
32 | } | |||||
33 | ||||||
34 | sub count { | |||||
35 | 188 | 357 | my $self = shift; | |||
36 | 188 188 | 350 633 | return scalar @{$self}; | |||
37 | } | |||||
38 | ||||||
39 | sub mean { | |||||
40 | 7 | 16 | my $self = shift; | |||
41 | ||||||
42 | 7 | 19 | return unless $self->count(); | |||
43 | 6 6 | 15 43 | return sum(@{$self}) / $self->count(); | |||
44 | } | |||||
45 | ||||||
46 | sub median { | |||||
47 | 5 | 12 | my $self = shift; | |||
48 | ||||||
49 | 5 | 14 | return unless $self->count(); | |||
50 | ||||||
51 | 4 | 10 | if ($self->count() % 2 == 1) { | |||
52 | 2 | 5 | return $self->[$self->count() / 2]; | |||
53 | } | |||||
54 | ||||||
55 | 2 | 6 | my $index_a = ($self->count() / 2) + 0.5; | |||
56 | 2 | 5 | my $index_b = ($self->count() / 2) - 0.5; | |||
57 | 2 | 6 | my $a = $self->[$index_a]; | |||
58 | 2 | 6 | my $b = $self->[$index_b]; | |||
59 | 2 | 8 | return ($a + $b) / 2; | |||
60 | } | |||||
61 | ||||||
62 | sub min { | |||||
63 | 4 | 9 | my $self = shift; | |||
64 | ||||||
65 | 4 | 11 | return unless $self->count(); | |||
66 | 3 | 16 | return $self->[0]; | |||
67 | } | |||||
68 | ||||||
69 | sub max { | |||||
70 | 4 | 9 | my $self = shift; | |||
71 | 4 | 11 | return unless $self->count(); | |||
72 | 3 | 30 | return $self->[-1]; | |||
73 | } | |||||
74 | ||||||
75 | sub standard_deviation { | |||||
76 | 3 | 6 | my $self = shift; | |||
77 | ||||||
78 | 3 | 9 | return 0 unless $self->count(); | |||
79 | 2 | 7 | my $mean = $self->mean(); | |||
80 | ||||||
81 | my $differences_sum = reduce { | |||||
82 | 18 | 46 | $a + ( ( $b - $mean )**2 ); | |||
83 | } | |||||
84 | 2 2 | 14 37 | 0, @{$self}; | |||
85 | ||||||
86 | 2 | 11 | my $sd = sqrt( $differences_sum / $self->count() ); | |||
87 | 2 | 8 | return $sd; | |||
88 | } | |||||
89 | ||||||
90 | sub percentile { | |||||
91 | 13 | 29 | my $self = shift; | |||
92 | 13 | 30 | my $percentile = shift; | |||
93 | ||||||
94 | 13 | 32 | my $n = int(( $percentile / 100 ) * $self->count() + 0.5) - 1; | |||
95 | 13 | 41 | $n = 0 if $n < 0; | |||
96 | 13 | 43 | return $self->[$n]; | |||
97 | } | |||||
98 | ||||||
99 | 1; | |||||
100 |