NAME
PDL::Apply - Apply a given function in "rolling" / "moving" / "over" manners
SYNOPSIS
use PDL;
use PDL::Apply ':all';
my $x = pdl([40.7,81.7,28.9,33.3,40.8,16.3]);
print $x->apply_rolling(3, 'sum');
# [ BAD BAD 151.3 143.9 103 90.4]
print $x->apply_over('sum');
# 241.7
print $x->sumover;
# 241.7
my $slices = indx([ [0, 2], [4, 5] ]);
print $x->apply_slice($slices, 'sum');
# [151.3, 57.1]
# 151.3 = 40.7+81.7+28.9 (indices 0..2)
# 57.1 = 40.8+16.3 (indices 4..5)
DESCRIPTION
This module allows you to:
- compute "rolling" functions (like
Moving Average) with given sliding window - compute "over" like functions (like
sumover) with arbitrary function applied
But keep in mind that the speed is far far beyond the functions with C implementation like sumover.
FUNCTIONS
By default, PDL::Apply doesn't import any function. You can import individual functions like this:
use PDL::Apply qw(apply_rolling apply_over);
Or import all available functions:
use PDL::Apply ':all';
apply_over
$result = apply_over($pdl, $func, @fargs);
#or
$result = $pdl->apply_over($func, @fargs);
# $pdl .. Input piddle, 1D or ND
# $func .. Function (PDL method) name as a string or code reference
# @fargs .. Optional arguments passed to function
apply_rolling
$result = apply_rolling($pdl, $width, $func, @fargs);
#or
$result = $pdl->apply_rolling($width, $func, @fargs);
# $pdl .. Input piddle, 1D or ND
# $width .. Size of rolling window
# $func .. Function (PDL method) name as a string or code reference
# @fargs .. Optional arguments passed to function
apply_slice
$result = apply_slice($pdl, $slices, $func, @fargs);
#or
$result = $pdl->apply_slice($slices, $func, @fargs);
# $pdl .. Input piddle, 1D or ND
# $slices .. Piddle (2,N) with slices - [startidx, endidx] pairs
# $func .. Function (PDL method) name as a string or code reference
# @fargs .. Optional arguments passed to function
LICENSE
This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.
COPYRIGHT
2015+ KMX kmx@cpan.org