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say "\nHere are a, b, and c:  " . $abc->[0] . ", "
  . $abc->[1] . ", " . $abc->[2];

# Helper functions:

# The cost_function_factory() takes a reference to an array containing
# real-world market distances and returns a reference to a cost function.
# The cost function takes a reference to an array of three coefficients,
# and returns the mean absolute percentage deviation of the calculated
# results from the real-world results based on this formula:
#
#     (a * sqrt(x + b)) + c
#
# where x is a number of trading days in the range 3 to 63.
sub cost_function_factory {
    my $real_world_distances = $_[0];
    my $current_coefficients;

    my $calculate_distance
      = sub {