From ed3ea4644752437f34512e85aaa60811ea2ddf0f Mon Sep 17 00:00:00 2001
From: Seth Mos <seth.mos@xs4all.nl>
Date: Mon, 22 Dec 2008 20:58:46 +0000
Subject: [PATCH] Add 0 values when the original also had values on that row so
 the graph math works.

---
 etc/inc/rrd.inc | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/etc/inc/rrd.inc b/etc/inc/rrd.inc
index 7e0862b4b3..a3e3b7e9bc 100644
--- a/etc/inc/rrd.inc
+++ b/etc/inc/rrd.inc
@@ -106,7 +106,17 @@ function migrate_rrd_format($rrdoldxml, $rrdnewxml) {
 			$vcountnew = count($rrdnewxml['rra'][$i]['database']['row'][$k]['v']);
 			foreach($row['v'] as $value) {
 				if(empty($rrdoldxml['rra'][$i]['database']['row'][$k]['v'][$m])) {
-					$rrdoldxml['rra'][$i]['database']['row'][$k]['v'][$m] = $rrdnewxml['rra'][$i]['database']['row'][$k]['v'][$m];
+					if(isset($valid)) {
+						$rrdoldxml['rra'][$i]['database']['row'][$k]['v'][$m] = "0.0000000000e+00 ";
+					} else {
+						$rrdoldxml['rra'][$i]['database']['row'][$k]['v'][$m] = $rrdnewxml['rra'][$i]['database']['row'][$k]['v'][$m];
+					}
+				} else {
+					if($value <> " NaN ") {
+						$valid = true;
+					} else {
+						$valid = false;
+					}
 				}
 				$m++;
 			}