Update: I missed the part about needing arbitrarily sized tuples. This only groups in sets of two...my bad. :(
Original message follows...
Ah, the joys of dot products. No need for recursion:
#!/usr/bin/perl -w
@set = qw(A B C);
print join("\n", map(join(',', @$_), @{&make_tuples(\@set, \@set)}));
sub make_tuples {
my($set1, $set2) = @_;
my @product;
foreach my $x (0 .. $#$set1) {
foreach my $y (0 .. $#$set2) {
push(@product, [$set1->[$x], $set2->[$y]]);
}
}
\@product;
}
I daresay I just answered a homework question for you, but so be it.
Matt
-
Are you posting in the right place? Check out Where do I post X? to know for sure.
-
Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
<code> <a> <b> <big>
<blockquote> <br /> <dd>
<dl> <dt> <em> <font>
<h1> <h2> <h3> <h4>
<h5> <h6> <hr /> <i>
<li> <nbsp> <ol> <p>
<small> <strike> <strong>
<sub> <sup> <table>
<td> <th> <tr> <tt>
<u> <ul>
-
Snippets of code should be wrapped in
<code> tags not
<pre> tags. In fact, <pre>
tags should generally be avoided. If they must
be used, extreme care should be
taken to ensure that their contents do not
have long lines (<70 chars), in order to prevent
horizontal scrolling (and possible janitor
intervention).
-
Want more info? How to link
or How to display code and escape characters
are good places to start.
|