Perl: the Markov chain saw PerlMonks

by abaxaba (Hermit)
 on Jun 04, 2004 at 18:05 UTC Need Help??

If this had been a real emergency....
```#!/usr/bin/perl
open (X,\$0);X([<X>]);sub X{\$x=shift;print pack("C*",
map{s|X|**|g;s|x|*|g;eval;}(split(/\|/,join("",
map{s|\#||;eval}(grep/x/,(grep/^\#/,@\$x))))));}
#\$x="2x37|13x3X2|23x5|29x2X2|2X5|5x13|5x2x11|3x37|29x2X2|13x2X3|101|19
+x3x2";
#\$x="|2X5|2X4x5|101|19x3x2|3X3x2X2|2X5|2X3x3X2|97|3X2x11|107|101|19x3x
+2";

For those of you with old versions of CGI.pm (eg no Vars method)

```use CGI qw(param);

my %hash= map{my \$v=[param(\$_)];\$_,\$#\$v>0?join
("\0",@\$v):shift@\$v}param();

Here's a way to break @ary into blocks of size \$x; Also check to make sure you don't exceed the array length.

```my \$x=50; #blocksize
foreach (my \$i=0;\$i<=int(\$#ary/50);\$i++)
{
my \$end = (\$x*\$i+\$x-1>=\$#ary?\$#ary:(\$x*\$i+\$x-1);
my @keep = @ary[\$i*\$x..\$end];
# Do stuff with @keep
}
I had to resort an array, like this graphical representation:

```Original

1 2
3 4
5 6
7 8

EG:(1..8)

TO

1 5
2 6
3 7
4 8

EG:(1,5,2,6,3,7,4,8).
```

```my @sorted;
my @array=(0..10);

@first = splice (@array, 0, int((\$#array+2)/2));

@sorted=map{(shift @first, shift @array)}(0..\$#array);
push (@sorted, shift @first) if ++\$#first;

<code> #!/usr/bin/perl main("quick","brown","fox"); sub main { my \$str = "harry.is.brown\n"; my \$k=split(/(.)/,\$str);#split/./,list context resolves to @_="\n"; print @_; #split /\./,\$str; } my \$ctr='a'; print \$ctr++ . "\n" foreach (1..26); You can also do things like 'aa'..'zz'.

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