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Fix calculation of standard deviation. From Brian C. Grayson <bgrayson@orac.ece.utexas.edu>

This commit is contained in:
jwise 1999-02-25 03:35:34 +00:00
parent 45a5ad4153
commit 1b92119539
1 changed files with 4 additions and 4 deletions
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8
sbin/ping/ping.c
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@ -1,4 +1,4 @@
/* $NetBSD: ping.c,v 1.44 1999/02/24 19:31:38 jwise Exp $ */
/* $NetBSD: ping.c,v 1.45 1999/02/25 03:35:34 jwise Exp $ */
/*
* Copyright (c) 1989, 1993
@ -62,7 +62,7 @@
#include <sys/cdefs.h>
#ifndef lint
__RCSID("$NetBSD: ping.c,v 1.44 1999/02/24 19:31:38 jwise Exp $");
__RCSID("$NetBSD: ping.c,v 1.45 1999/02/25 03:35:34 jwise Exp $");
#endif
#include <stdio.h>
@ -1111,12 +1111,12 @@ summary(int header)
if (nreceived && (pingflags & F_TIMING)) {
double n = nreceived + nrepeats;
double avg = (tsum / n);
double variance = (tsumsq / (n - (avg * avg)));
double variance = ((tsumsq/n) - avg*avg) * (n/(n-1));
printf("round-trip min/avg/max/stddev = "
"%.3f/%.3f/%.3f/%.3f ms\n",
tmin * 1000.0, avg * 1000.0,
tmax * 1000.0, sqrt(variance * 1000.0));
tmax * 1000.0, sqrt(variance) * 1000.0);
if (pingflags & F_FLOOD) {
double r = diffsec(&last_rx, &first_rx);
double t = diffsec(&last_tx, &first_tx);