Beefy Boxes and Bandwidth Generously Provided by pair Networks
Perl: the Markov chain saw
 
PerlMonks  

Re: picking multiple random elements out of an array

by chipmunk (Parson)
on Feb 04, 2002 at 07:05 UTC ( #143173=note: print w/ replies, xml ) Need Help??


in reply to picking multiple random elements out of an array

Here's an extension of the FAQ's method for selecting a random line from a file. This one selects multiple lines/entries. It keeps the selected entries in their original order.

my $count = 5; my @select; my $i = 0; for (@array) { push @select, $_ if rand() < ($count / ++$i); if (@select > $count) { splice(@select, rand($#select), 1); } }


Comment on Re: picking multiple random elements out of an array
Download Code

Log In?
Username:
Password:

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://143173]
help
Chatterbox?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others perusing the Monastery: (5)
As of 2015-07-03 03:34 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?

    The top three priorities of my open tasks are (in descending order of likelihood to be worked on) ...









    Results (48 votes), past polls