Etsy's skyline port to perl
First, skyline is an anomaly detection tool published by Etsy. It use numpy/scipy to implement 9 detection algorithms. You can find it at http://github.com/etsy/skyline.git
I have heard PDL for a long time, and then I thought: maybe I can re-implement those algorithms using PDL? This must be the best way to learn PDL!
Now, I got it done.
I should say that PDL is not so easy to write as numpy. For example: you must write '$p->index($p->nelem - 1)' to just get the last one of an array! In numpy, the numpy object has methods almost totally like original object. But in PDL, we didn't get these easily things...you can't write '$p->[-1]' or even '$p->index(-1)'!tks, I change this to '$p->at(-1)' now.
BTW, I didn't find any K-S test implement at CPAN(well, except Statisic::R),so I use S-W test instead. S-W test is better when the length of array is less than 5000. I think the check values in latest one hour should be less than this, yes?