From bb758490c8880f349084e79ee587dae439fc6871 Mon Sep 17 00:00:00 2001
From: Steffen Vogel <stvogel@eonerc.rwth-aachen.de>
Date: Tue, 19 May 2015 16:54:00 +0200
Subject: [PATCH] use Box-Muller method to generate random walk messages

---
 server/src/msg.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/server/src/msg.c b/server/src/msg.c
index 67b93ef2a..7d5dc5738 100644
--- a/server/src/msg.c
+++ b/server/src/msg.c
@@ -82,7 +82,7 @@ int msg_fscan(FILE *f, struct msg *m)
 void msg_random(struct msg *m)
 {
 	for (int i = 0; i < m->length; i++)
-		m->data[i].f += (float) random() / RAND_MAX - .5;
+		m->data[i].f += box_muller(0, 1);
 
 	m->endian = MSG_ENDIAN_HOST;
 }