From 8ca6bc2fe9b56fc576c5d4746b76229807e28293 Mon Sep 17 00:00:00 2001
From: bma <baptiste.marechal@femto-st.fr>
Date: Mon, 26 Mar 2018 12:16:45 +0200
Subject: [PATCH] use real part of cov instead of abs

---
 allan_cov.m | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/allan_cov.m b/allan_cov.m
index 9bc88fb..f35537b 100644
--- a/allan_cov.m
+++ b/allan_cov.m
@@ -328,7 +328,7 @@ if isfield(data,'rate') && data.rate > 0 % if data rate was given
 		fd2=diff(fa2);
 		% calculate two-sample variance for this tau
 		M=length(fa);
-		sm(k)=sqrt(0.5/(M-1)*(abs(sum(fd.*fd2))));
+		sm(k)=sqrt(0.5/(M-1)*(real(sum(fd.*fd2))));
 
 		% estimate error bars
 		sme(k)=sm(k)/sqrt(M+1);
-- 
2.16.4