Re^2: calculate average in sliding windows

[Eliya]

A less computationally intensive variant would be to directly maintain a $sum, to which you add/subtract individual values (instead of push/shift on an array, from which you then recompute the sum every time):

#!/usr/bin/perl -lw
use strict;
use constant WINDOW => 10;

#my @data  = map int( rand 10 ), 1 .. 30;
my @data = qw(3 8 8 2 5 5 0 3 8 3 2 3 2 3 5 4 8 7 5 4 6 3 1 6 3 6 0 7 
+3 3);

my @mAves;
my $sum = 0;
for my $i (0..$#data) {
    $sum += $data[$i];
    $sum -= $data[$i-WINDOW()] if $i >= WINDOW;
    push @mAves, $sum / WINDOW if $i >= WINDOW-1;
}

print join ' ', @data;
print join '   ', @mAves;

__END__
3 8 8 2 5 5 0 3 8 3 2 3 2 3 5 4 8 7 5 4 6 3 1 6 3 6 0 7 3 3
4.5   4.4   3.9   3.3   3.4   3.4   3.3   4.1   4.5   4.2   4.3   4.7 
+  4.7   4.6   4.9   4.7   4.9   4.1   4.1   3.9   3.8