A stemplot is a form of histogram (see Simple Text Histogram) used to display numerical data.
This function will display a stemplot for the numerical data provided. It is intended for use on an Xterm or equivalent, and so should not have large data sets passed to it. 
#!/usr/bin/perl

use strict;
use diagnostics;
use POSIX;

sub stemplot {

  my $p = shift;
  my @sortedData = sort { $a <=> $b } @$p;

  my $div = 10 ** (floor log10 $sortedData[ int ($#sortedData / 2)]);
  my $range = $sortedData[-1] - $sortedData[0];

  if (($range / $div) < 5.0) {
    $div /= 10;
  }
  elsif (($range / $div) > 35.0) {
    $div *= 10;
  }

  my @dataTo1DecimalPlace = map { sprintf "%.1f", ($_ / $div) } @sorte
+dData;

  my %leaves;

  foreach (@dataTo1DecimalPlace) {
    my $stem = floor $_;
    $leaves{$stem} .= sprintf "%1.0f", 10 * ($_ - $stem);
  }

  my $minStem = floor $dataTo1DecimalPlace[0];
  my $maxStem = floor $dataTo1DecimalPlace[-1];
  print "key: 10 stem = ", 10 * $div, " data\n";

  foreach ($minStem .. $maxStem) {
    printf "%3d: %s\n", $_, defined $leaves{$_} ? $leaves{$_} : "";
  }

  print "\n";

}

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In reply to Stemplot A.K.A. Stem and Leaf Plot by perlmoth

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