Beefy Boxes and Bandwidth Generously Provided by pair Networks
The stupid question is the question not asked

markov (The Practice of Programming)

by powerman (Friar)
on Apr 23, 2002 at 10:17 UTC ( #161252=snippet: print w/ replies, xml ) Need Help??
Description: Another cook book - "The Practice of Programming" by Kernighan and Pike. And again, realization of "Markov chains algorithm" on page 123 can and must be optimized! So clever C/C++/Java examples and so ugly Perl example... :-(
# variant from "The Practice of Programming"

$MAXGEN  = 10000;
$NONWORD = "\n";
$w1 = $w2 = $NONWORD;
while (<>) {
    foreach (split) {
    push(@{$statetab{$w1}{$w2}}, $_);
    ($w1, $w2) = ($w2, $_);
push(@{$statetab{$w1}{$w2}}, $NONWORD);

$w1 = $w2 = $NONWORD;
for ($i=0; $i<$MAXGEN; $i++) {
    $suf = $statetab{$w1}{$w2};
    $r = int(rand @$suf);
    exit if (($t = $suf->[$r]) eq $NONWORD);
    print "$t\n";
    ($w1, $w2) = ($w2, $t);

# my variant

#!/usr/bin/perl -a0n
push @{$m{$F[$_-1]}{$F[$_]}}, $F[$_+1] for 1..$#F;
1 while defined($F[2+$i++] = splice @{$m{$F[0+$i]}{$F[1+$i]}},
    rand(@{$m{$F[0+$i]}{$F[1+$i]}}), 1);
print join(" ",@F[0..1+$i]),"\n";
Log In?

What's my password?
Create A New User
Node Status?
node history
Node Type: snippet [id://161252]
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others lurking in the Monastery: (10)
As of 2016-07-01 19:27 GMT
Find Nodes?
    Voting Booth?
    What is your favorite alternate name for a (specific) keyboard key?

    Results (14 votes). Check out past polls.