From ce66c836f039feda09e419bcba70eda21f81f92f Mon Sep 17 00:00:00 2001
From: Dima Kogan <dkogan@cds.caltech.edu>
Date: Sun, 6 Feb 2011 15:34:46 -0800
Subject: [PATCH] --xlen now MUST be used with --stream. There was no error
 before, but it still didn't make any conceptual sense

---
 bin/feedGnuplot | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/bin/feedGnuplot b/bin/feedGnuplot
index 64ad78a..8d79498 100755
--- a/bin/feedGnuplot
+++ b/bin/feedGnuplot
@@ -126,8 +126,9 @@ As an example, if line 3 of the input is "0 9 1 20"
 
   --autolegend         Use the curve IDs for the legend
 
-  --xlen xxx           Set the size of the x-window to plot. Omit this or set it
-                       to 0 to plot ALL the data. Does not make sense with 3d plots
+  --xlen xxx           When using --stream, sets the size of the x-window to plot.
+                       Omit this or set it to 0 to plot ALL the data. Does not
+                       make sense with 3d plots
 
   --xmin  xxx          Set the range for the x axis. These are ignored in a
                        streaming plot
@@ -258,6 +259,12 @@ OEF
       exit -1;
     }
   }
+
+  if(defined $options{xlen} && !defined $options{stream} )
+  {
+    print STDERR "--xlen does not make sense without --stream\n";
+    exit -1;
+  }
 }
 
 sub getGnuplotVersion