From 34a4d5cb64e19d721c7fc68e0f62aa3295cc2ab0 Mon Sep 17 00:00:00 2001
From: Dave Marchant <dwfmarchant@gmail.com>
Date: Tue, 11 Feb 2014 21:29:25 -0800
Subject: [PATCH] Mass derivs in cylindrical mesh.

---
 SimPEG/Mesh/Cyl1DMesh.py | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/SimPEG/Mesh/Cyl1DMesh.py b/SimPEG/Mesh/Cyl1DMesh.py
index cd232cf6..418a866b 100644
--- a/SimPEG/Mesh/Cyl1DMesh.py
+++ b/SimPEG/Mesh/Cyl1DMesh.py
@@ -293,6 +293,15 @@ class Cyl1DMesh(object):
     _aveF2CC = None
     aveF2CC = property(**aveF2CC())
 
+    def getFaceMassDeriv(self):
+        Av = self.aveF2CC
+        return Av.T * sdiag(self.vol)
+
+    def getEdgeMassDeriv(self):
+        Av = self.aveE2CC
+        return Av.T * sdiag(self.vol)
+
+
     ####################################################
     # Methods
     ####################################################