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#!/usr/bin/perl -s
use v5.16;
use Test2::V0 '!float';
use PDL;
use PDL::NiceSlice;
our ($tests, $examples, $order);
$order //= 1;
run_tests() if $tests || $examples; # does not return
die <<EOS unless @ARGV;
usage: $0 [-examples] [-tests] [-order=N] [K...]
-examples
run the examples from the challenge
-tests
run some tests
-order=N
find forward difference sequence of order N. Default: 1
K...
list of numbers
EOS
### Input and Output
say "@{diff($order, @ARGV)}";
### Implementation
sub diff {
my $n = shift;
my $l = pdl @_;
$l = $l(1:-1) - $l(0:-2) for 1 .. $n;
$l->unpdl;
}
### Examples and tests
sub run_tests {
SKIP: {
skip "examples" unless $examples;
is diff(1, [5, 9, 2, 8, 1, 6]),
[4, -7, 6, -7, 5], 'example 1';
is diff(2, [5, 9, 2, 8, 1, 6]),
[-11, 13, -13, 12], 'example 2';
}
SKIP: {
skip "tests" unless $tests;
}
done_testing;
exit;
}
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