From 3436ca97cbccd9068c79bf201cb367de60789f37 Mon Sep 17 00:00:00 2001
From: "David A. Mellis" <d.mellis@arduino.cc>
Date: Mon, 4 Jun 2012 23:30:41 -0400
Subject: [PATCH] Printing NaN values as "nan" in printFloat().

http://code.google.com/p/arduino/issues/detail?id=946
---
 cores/arduino/Print.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/cores/arduino/Print.cpp b/cores/arduino/Print.cpp
index e541a6c..98969f5 100755
--- a/cores/arduino/Print.cpp
+++ b/cores/arduino/Print.cpp
@@ -226,6 +226,8 @@ size_t Print::printFloat(double number, uint8_t digits)
 { 
   size_t n = 0;
   
+  if (isnan(number)) return print("nan");
+  
   // Handle negative numbers
   if (number < 0.0)
   {