Beefy Boxes and Bandwidth Generously Provided by pair Networks
Problems? Is your data what you think it is?

comment on

( #3333=superdoc: print w/replies, xml ) Need Help??
Here's one way to compute the combinations that can be created by drawing a single element from each of a list of given sets:
#!/usr/bin/perl -l use warnings; use strict; use List::Util qw( reduce ); sub combinations { no warnings qw( once ); reduce { outer_r($a,$b) } [[]], reverse @_; } sub outer_r { my ($ys, $xs) = @_; my @product; foreach my $x (@$xs) { foreach my $y (@$ys) { push @product, [$x, @$y]; } } return \@product; }
The combinations function takes a list of sets (each represented as an arrayref) and returns the combinations that can be created from them:
use Data::Dumper; $Data::Dumper::Terse = 1; $Data::Dumper::Indent = 0; print Dumper( combinations( [1..3], ["a","b"] ) ), "\n"; # [[1,'a'],[1,'b'],[2,'a'],[2,'b'],[3,'a'],[3,'b']]
With this function, we can turn to your question of how best to represent your character sets. I would just use strings to keep things simple. A helper function will convert strings into the form needed by combinations and then convert the results back into strings:
sub charset_combinations { my @charsets = map [split//], @_; map join("", @$_), @{ combinations( @charsets ) }; }
Let's use our new helper to find all of the 3-character combinations that can be made from the charset "abc":
my @abcees3 = charset_combinations( ("abc") x 3 ); print "@abcees3\n"; # aaa aab aac aba abb abc aca acb acc\ # baa bab bac bba bbb bbc bca bcb bcc\ # caa cab cac cba cbb cbc cca ccb ccc
We can even draw successive characters from different character sets:
my @charsets = qw( abc 123 !@$ ); foreach my $string_length (0 .. @charsets) { my @genstrings = charset_combinations( @charsets[0..$string_length-1] ); print "$string_length: @genstrings\n"; } # 0: # 1: a b c # 2: a1 a2 a3 b1 b2 b3 c1 c2 c3 # 3: a1! a1@ a1$ a2! a2@ a2$ a3! a3@ a3$\ # b1! b1@ b1$ b2! b2@ b2$ b3! b3@ b3$\ # c1! c1@ c1$ c2! c2@ c2$ c3! c3@ c3$
I hope this gives you some helpful ideas.


In reply to Re: character generator by tmoertel
in thread character generator by semio

Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post; it's "PerlMonks-approved HTML":

  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.
  • Log In?

    What's my password?
    Create A New User
    and the web crawler heard nothing...

    How do I use this? | Other CB clients
    Other Users?
    Others wandering the Monastery: (9)
    As of 2021-04-12 12:57 GMT
    Find Nodes?
      Voting Booth?

      No recent polls found