Beefy Boxes and Bandwidth Generously Provided by pair Networks
Just another Perl shrine
 
PerlMonks  

comment on

( [id://3333]=superdoc: print w/replies, xml ) Need Help??

You can get a random subset without replacement using List::Util::shuffle().

use List::Util qw/shuffle/; sub pick { return if @_ != 2; my ($num, $count) = @_; (shuffle 1 .. $num)[0 .. $count-1]; }
To build a sample of picks with repetition allowed:
my ($top, $ct, @samples) = (158, 8); my $size = 50,000; $#samples = $size; $_ = [pick( $top, $ct)] for @samples;
You can keep them unique by storing the samples as keys of a hash,
my %sample; $sample{join ',', pick($top, $ct)} = undef while $size > keys %sample;
If you need a memory-breaking large sample, look to a file or database to hold it. Tie::File would be simple to use for that.

Does order matter in a sample? If not, then sort them to get a canonical order before storage.

After Compline,
Zaxo


In reply to Re: Sampling from Combination Space by Zaxo
in thread Sampling from Combination Space by AdriftOnMemoryBliss

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



  • 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.
Log In?
Username:
Password:

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

How do I use this?Last hourOther CB clients
Other Users?
Others wandering the Monastery: (4)
As of 2024-03-28 16:59 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?

    No recent polls found