From eac89fff176e0983c23bf9999c9afcca8b0a89a9 Mon Sep 17 00:00:00 2001
From: adehad <26027314+adehad@users.noreply.github.com>
Date: Tue, 21 May 2019 15:12:21 +0100
Subject: [PATCH] circ_vmpdf large kappa stability fix

https://github.com/circstat/circstat-matlab/issues/6
---
 circ_vmpdf.m | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/circ_vmpdf.m b/circ_vmpdf.m
index 7d158c3..11cc2ff 100644
--- a/circ_vmpdf.m
+++ b/circ_vmpdf.m
@@ -42,6 +42,5 @@
 alpha = alpha(:);
 
 % evaluate pdf
-C = 1/(2*pi*besseli(0,kappa));
-p = C * exp(kappa*cos(alpha-thetahat));
+p = exp( kappa*(cos(alpha-thetahat)-1) ) / (2*pi*besseli(0,kappa,1));
 end