Ok, thanks. So maybe like this?
#!/usr/bin/perl -lw
use strict;
use constant WINDOW => 30;
my $sum = 0;
my $n = 0;
my $p = WINDOW;
while (<DATA>) {
my ($pos, $val) = split;
if (eof) { # corner case
$sum += $val;
$n++;
}
if ($pos > $p or eof) {
print $sum / $n if $n > 0;
$sum = 0;
$n = 0;
$p += WINDOW while $pos > $p;
}
$sum += $val;
$n++;
}
__DATA__
1 1
10 3
30 1
40 2
60 2
Output:
1.66666666666667
2
(Upd: fixed handling of corner case)
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