From 7d8c2dca27706f0292a9eefb86317e53292e4a44 Mon Sep 17 00:00:00 2001
From: riccioclista <riccio.clista@gmail.com>
Date: Fri, 27 Apr 2018 09:28:58 +0200
Subject: [PATCH] Fix _pnn50: Use float division and correct array len

Integer division has always yielded 0.
The array length must be taken from the diff array (which is 1 less than rri)
---
 hrv/classical.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/hrv/classical.py b/hrv/classical.py
index 36b1477..99b8687 100644
--- a/hrv/classical.py
+++ b/hrv/classical.py
@@ -27,7 +27,7 @@ def _nn50(rri):
 
 
 def _pnn50(rri):
-    return _nn50(rri) / len(rri) * 100
+    return float(_nn50(rri)) / (len(rri) - 1) * 100
 
 
 @validate_frequency_domain_arguments