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#!/Users/colincrain/perl5/perlbrew/perls/perl-5.32.0/bin/perl
#
# pythagoras-was-a-meanie.pl
#
# Pythagorean Means
# Submitted by: Mohammad S Anwar
# You are given a set of integers.
#
# Write a script to compute all three Pythagorean Means
# i.e Arithmetic Mean,
# Geometric Mean and
# Harmonic Mean
# of the given set of integers.
# Please refer to wikipedia page for more informations.
#
# Example 1:
# Input: @n = (1,3,5,6,9)
# Output: AM = 4.8, GM = 3.8, HM = 2.8
# CORRECTION [2022-03-21 16:35] GM = 3.9 (before)
#
# Example 2:
# Input: @n = (2,4,6,8,10)
# Output: AM = 6.0, GM = 5.2, HM = 4.4
# Example 3:
# Input: @n = (1,2,3,4,5)
# Output: AM = 3.0, GM = 2.6, HM = 2.2
# Pythagorean means in the manner of Pythagoras.
# Which was apparently that he was mean — a real bastard.
# I mean, that's a sort of middle-of-the-road opinion on the subject.
# Whatever that means.
#
# © 2022 colin crain
## ## ## ## ## ## ## ## ## ## ## ## ## ## ## ## ## ## ## ##
use warnings;
use strict;
use utf8;
use feature ":5.26";
use feature qw(signatures);
no warnings 'experimental::signatures';
use List::Util qw( sum product );
sub am ( @list ) {
return sum( @list ) / @list
}
sub gm ( @list ) {
return product( @list ) ** (1 / @list)
}
sub hm ( @list ) {
return @list / ( sum map { 1/$_ } @list )
}
# my @list = (1,3,5,6,9);
#
# say sprintf "%.1f", gm( @list);
#
use Test::More;
my @list;
@list = (1,3,5,6,9);
is ((sprintf "%.1f", am( @list)), 4.8, 'ex-1-am');
is ((sprintf "%.1f", gm( @list)), 3.8, 'ex-1-gm');
is ((sprintf "%.1f", hm( @list)), 2.8, 'ex-1-hm');
@list = (2,4,6,8,10);
is ((sprintf "%.1f", am( @list)), '6.0', 'ex-2-am');
is ((sprintf "%.1f", gm( @list)), 5.2, 'ex-2-gm');
is ((sprintf "%.1f", hm( @list)), 4.4, 'ex-2-hm');
@list = (1,2,3,4,5);
is ((sprintf "%.1f", am( @list)), '3.0', 'ex-3-am');
is ((sprintf "%.1f", gm( @list)), 2.6, 'ex-3-gm');
is ((sprintf "%.1f", hm( @list)), 2.2, 'ex-3-hm');
@list = (1,9);
is ((sprintf "%.1f", am( @list)), '5.0', 'blog-am');
is ((sprintf "%.1f", gm( @list)), 3.0, 'blog-gm');
is ((sprintf "%.1f", hm( @list)), 1.8, 'blog-hm');
done_testing();
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