From 5bf6539a9aab8763c601521601e6f3e47ac0cd34 Mon Sep 17 00:00:00 2001
From: Dima Kogan <dkogan@cds.caltech.edu>
Date: Thu, 27 Aug 2009 13:32:23 -0700
Subject: [PATCH] don't try to plot if we have no data

Ignore-this: 808c5f30dd3fabc33d6980dce972794

darcs-hash:20090827203223-0cb85-2e0d29077c97f12711a1899f0ae9086860a56da4.gz
---
 driveGnuPlots.pl | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/driveGnuPlots.pl b/driveGnuPlots.pl
index dd7b827..8146303 100755
--- a/driveGnuPlots.pl
+++ b/driveGnuPlots.pl
@@ -204,7 +204,7 @@ sub mainThread {
         }
       }
 
-      elsif($options{"stream"})
+      elsif($options{"stream"} && defined $xlast)
       {
         cutOld($xlast - $xwindow);
         plotStoredData($xlast - $xwindow, $xlast);