Beefy Boxes and Bandwidth Generously Provided by pair Networks
Perl Monk, Perl Meditation

comment on

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

I remember, some time ago, looking under the hood of Algorithm::Combinatorics, to find it somewhat inefficient. The ntheory equivalents, if they exist, are faster:

use ntheory 'forcomb'; sub Eily_LanX_vr { my ( $length, $ones ) = @_; my ( $str, $s, @r ); $str = '0' x $length; forcomb { $s = $str; substr $s, $_, 1, '1' for @_; push @r, $s; } $length, $ones; return \@r } cmpthese(-3, { Eily_LanX_vr => sub { Eily_LanX_vr(25, 5) }, Eily_LanX => sub { Eily_LanX(25, 5) }, }); __END__ Rate Eily_LanX Eily_LanX_vr Eily_LanX 11.9/s -- -59% Eily_LanX_vr 29.0/s 143% --

In reply to Re^3: Generate all unique combinations of 1 and 0 using specified length of "0"-string and count of 1's by vr
in thread Generate all unique combinations of 1 and 0 using specified length of "0"-string and count of 1's by Lana

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 or How to display code and escape characters are good places to start.
Log In?

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

How do I use this? | Other CB clients
Other Users?
Others musing on the Monastery: (3)
As of 2022-09-28 06:54 GMT
Find Nodes?
    Voting Booth?
    I prefer my indexes to start at:

    Results (124 votes). Check out past polls.