71 lines
2.1 KiB
Perl
71 lines
2.1 KiB
Perl
package DDG::Goodie::Average;
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# ABSTRACT: take statistics for a list of numbers
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use DDG::Goodie;
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triggers startend => "avg", "average", "mean", "median", "root mean square";
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zci is_cached => 1;
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zci answer_type => "average";
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primary_example_queries 'average 12, 45, 78, 1234';
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secondary_example_queries 'avg 1,2,3', 'root mean square 1,2,3';
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description 'take the average of a list of numbers';
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name 'Average';
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code_url 'https://github.com/duckduckgo/zeroclickinfo-goodies/blob/master/lib/DDG/Goodie/Average.pm';
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category 'calculations';
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topics 'math';
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attribution twitter => 'crazedpsyc',
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cpan => 'CRZEDPSYC' ;
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handle remainder => sub {
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#Remove leading/trailing text from list of numbers
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s/^[a-zA-Z\s]+//;
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s/\s+[a-zA-Z]+$//;
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#Ensure numbers are space-delimited
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s/[;,\s{}\[\]\(\)]+/ /g;
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#Return unless only left with space-delimited list of numbers
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return unless /^\s*(?:\d+(?:\.\d+)?\s?)*$/;
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#Get numbers into an array
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my @nums = split ' ', $_;
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#Must have at least two numbers
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return unless @nums > 1;
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# initialize the sum
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my $sum;
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# calculate the sum
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$sum += $_ for @nums;
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# get the length of the array
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my $len = @nums;
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# calculate the mean
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my $mean = $sum/$len;
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# sort the list numerically, least to greatest
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@nums = sort { $a <=> $b } @nums;
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my $med;
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if ($len % 2 eq 0) {
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# get the two middle numbers, since the
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# length is even, and calculate their mean
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$med = ($nums[$len/2] + $nums[$len/2-1])/2;
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} else {
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# get the middle number
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$med = $nums[int($len/2)]
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}
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my $rms;
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$rms += ($_ ** 2) for @nums;
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$rms /= $len;
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$rms = sqrt $rms;
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return "Mean: $mean; Median: $med; Root Mean Square: $rms", html => "<div class='average--container'><div><span class='average--key'>Mean:</span> <span class='average--value'>$mean</span></div> <div><span class='average--key'>Median:</span> <span class='average--value'>$med</span></div> <div><span class='average--key'>Root Mean Square:</span> <span class='average--value'>$rms</span></div></div>";
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};
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1;
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