Beefy Boxes and Bandwidth Generously Provided by pair Networks
Don't ask to ask, just ask
 
PerlMonks  

Comment on

( #3333=superdoc: print w/replies, xml ) Need Help??

redo LABEL is the answer to your question, but here are a couple of "better" ways to select $maxclients unique elements from a bag (@weighteddiv).

This approach has the advantage of being simple, but it is relatively slow for large datasets and does not preserve the order in which the numbers were picked:

my @weighteddiv = (('1234') x 7, ('9876') x 42, ('1123') x 13); my %selected; my $maxclients = 2; until (keys %selected == $maxclients or @weighteddiv == 0) { my $i = rand(+@weighteddiv); # Not $# my $pluck = splice @weighteddiv, $i, 1; ++$selected{$pluck}; } my @selected = keys %selected; print "Selected: @selected\n";

You can preserve the order with a little more code in the loop to create @selected incrementally:

if (++$selected{$pluck} == 1) { push @selected, $pluck; }

Finally, a complicated but efficient solution involving probabilities:

my @weighteddiv = (('1234') x 7, ('9876') x 42, ('1123') x 13); my @selected; my $maxclients = 2; my %occurrence; foreach (@weighteddiv) { $occurrence{$_}++; } my $total = @weighteddiv; until (@selected == $maxclients or keys %occurrence == 0) { my $i = rand($total); keys %occurrence; # reset hash iterator while (my ($value, $count) = each %occurrence) { if ($i < $count) { push @selected, $value; delete $occurrence{$value}; $total -= $count; last; } $i -= $count; } } print "Selected: @selected\n";

Caveat: All solutions untested.


In reply to Re: removing the goto by TilRMan
in thread removing the goto by scoobyrico

Title:
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?
    Username:
    Password:

    What's my password?
    Create A New User
    Chatterbox?
    and all is quiet...

    How do I use this? | Other CB clients
    Other Users?
    Others surveying the Monastery: (7)
    As of 2017-11-17 23:33 GMT
    Sections?
    Information?
    Find Nodes?
    Leftovers?
      Voting Booth?
      In order to be able to say "I know Perl", you must have:













      Results (276 votes). Check out past polls.

      Notices?