#! /p/bin/perl -w
# Print n pairs of floating point values.
# Each value is in the range [0,1).
# Usage: rand n

# Copyright (C) 1997 Free Software Foundation, Inc.

# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.

# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.

# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.


# Use only the basename from the path to this executable in error messages.
($program_name = $0) =~ s|.*/||;

require 'newgetopt.pl';
$MAXINT = 0x7fffffff;

undef $opt_help;
undef $opt_verbose;
undef $opt_integer;
&usage if (&NGetOpt(('seed=i', 'range=s', 'help', 'items-per-line=i',
		     'format=s', 'integer', 'verbose')) == 0);

&usage if (defined ($opt_help));

&usage if (scalar (@ARGV) != 1 || $ARGV[0] !~ /^[0-9]+$/);
$n = $ARGV[0];

if (!defined ($opt_seed))
  {
    $opt_seed = time;
    print STDERR "seed= $opt_seed\n" if (defined ($opt_verbose));
  }

srand ($opt_seed);

# FIXME: make sure this number is positive.
$opt_items_per_line = 1 if (!defined ($opt_items_per_line));

if (defined ($opt_integer))
  {
    $opt_format = "%d" if (!defined ($opt_format));
    if (defined ($opt_range))
      {
	# FIXME: allow FP endpoints even though --integer specified?
	if ($opt_range =~ /^([0-9]+),([0-9]+)$/)
	  {
	    $lo = $1;
	    $hi = $2;
	  }
	else
	  {
	    print STDERR ("bad argument `$opt_range' to --range option\n");
	    exit 2;
	  }
      }
    else
      {
	$lo = 0;
	$hi = $MAXINT;
      }

    # Increase by one because we'll have to truncate to get integers.
    $hi += 1;
  }
else
  {
    $opt_format = "%.15g" if (!defined ($opt_format));
    if (defined ($opt_range))
      {
	if ($opt_range =~ /^(-?[0-9.]+),(-?[0-9.]+)$/)
	  {
	    $lo = $1;
	    $hi = $2;
	  }
	else
	  {
	    print STDERR ("bad argument `$opt_range' to --range option\n");
	    exit 2;
	  }
      }
    else
      {
	$lo = 0.0;
	$hi = 1.0;
      }
  }

# FIXME: warn if lo > hi.

$range = $hi - $lo;

if ($opt_items_per_line == 1)
  {
    for ($i=0; $i < $n; $i++)
      {
	printf $opt_format, $lo + rand($range);
	print "\n";
      }
  }
else
  {
    $separator = ' ';
    for ($i=0; $i < $n; $i++)
      {
	for ($j=0; $j < $opt_items_per_line; $j++)
	  {
	    printf $opt_format, $lo + rand($range);
	    print $j == $opt_items_per_line - 1 ? "\n" : $separator;
	  }
      }
  }

exit 0;

sub usage
{
  print STDERR <<EOF;
Usage: $program_name [OPTIONS] n
    --help
    --seed=n
    --integer
    --items-per-line=n
    --range=i,j e.g. 3,9  or 1.5,33.9
    --format='%3d'
    --verbose (report the seed if it gets default value)
EOF
  exit 2;
}