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package PerlBench::Stats; |
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3
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1
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1
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3622
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use strict; |
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25
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5
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1
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1
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use base 'Exporter'; |
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1
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226
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6
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our @EXPORT_OK = qw(calc_stats); |
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our $VERSION = "1.001"; |
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9
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10
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sub calc_stats { |
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6
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6
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0
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1408
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my($samples, $hash) = @_; |
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6
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50
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31
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$hash ||= {}; |
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6
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15
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my @t = sort {$a <=> $b} @$samples; |
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14
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6
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my $n = @t; |
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6
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100
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return undef unless $n; |
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5
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7
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my $sum = 0; |
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my $sum2 = 0; |
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5
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15
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for (@t) { |
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12
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16
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$sum += $_; |
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12
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19
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$sum2 += $_ * $_; |
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} |
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24
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5
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11
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$hash->{avg} = $sum / $n; |
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5
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12
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$hash->{stddev} = sqrt(($sum2 - ($sum * $sum)/$n) / $n); |
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27
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5
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8
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$hash->{min} = $t[0]; |
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5
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100
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17
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$hash->{med} = ($n % 2) ? $t[$n/2] : (($t[$n/2-1] + $t[$n/2])/2); |
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5
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6
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$hash->{max} = $t[-1]; |
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5
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11
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$hash->{n} = $n; |
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32
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5
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10
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return $hash; |
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} |
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35
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1; |