From 1cf19fa50adab28d179ee459571d3ad8759e541e Mon Sep 17 00:00:00 2001
From: TT <edy555@gmail.com>
Date: Mon, 21 Oct 2019 20:25:17 +0900
Subject: [PATCH] fix: invert sign of group delay

---
 plot.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/plot.c b/plot.c
index cd86255f..a0a16ef7 100644
--- a/plot.c
+++ b/plot.c
@@ -442,7 +442,7 @@ float phase(float *v)
 /*
  * calculate groupdelay
  */
-float groupdelay(float *w, float *v, float deltaf)
+float groupdelay(float *v, float *w, float deltaf)
 {
 #if 1
   // atan(w)-atan(v) = atan((w-v)/(1+wv))