go ahead... be a heretic PerlMonks

### Comment on

 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: & & < < > > [ [ ] ]
• Link using PerlMonks shortcuts! What shortcuts can I use for linking?
• See Writeup Formatting Tips and other pages linked from there for more info.

Create A New User
Chatterbox?
and all is quiet...

How do I use this? | Other CB clients
Other Users?
Others exploiting the Monastery: (3)
As of 2018-05-26 07:20 GMT
Sections?
Information?
Find Nodes?
Leftovers?
Voting Booth?
World peace can best be achieved by:

Results (192 votes). Check out past polls.

Notices?