Merged Seogi's code into the Tensor Mesh code base.

This is under the DiffOperators class, which can be inherited with BaseMesh to any Mesh Object.

Cell area and other dimension calculations are included in the TensorMesh class.

Wrote unit tests for cell vol, area, and edges.

SimPEG/tests/test_div.py

@@ -3,7 +3,6 @@ import numpy as np
 import sys
 sys.path.append('../')
 from TensorMesh import TensorMesh
-from getDIV import getDivMatrix, getarea, getvol
 
 
 err=0.
@@ -11,7 +10,7 @@ print '>> Test face Divergence operator'
 for i in range(4):
     icount=i+1
     nc = 2**icount
-    # Define the mesh        
+    # Define the mesh
     h1 = np.ones((1,nc))/nc
     h2 = np.ones((1,nc))/nc
     h3 = np.ones((1,nc))/nc
@@ -21,28 +20,26 @@ for i in range(4):
     #n = M.plotGrid()
 
     # Generate DIV matrix
-    DIV = getDivMatrix(h)
-    
+    DIV = M.DIV
+
     #Test function
     fun = lambda x: np.sin(x)
     Fx = fun(M.gridFx[:,0])
     Fy = fun(M.gridFy[:,1])
     Fz = fun(M.gridFz[:,2])
-    
+
     F = np.concatenate((Fx,Fy,Fz))
     divF = DIV*F
     sol = lambda x, y, z: (np.cos(x)+np.cos(y)+np.cos(z))
     divF_anal = sol(M.gridCC[:,0], M.gridCC[:,1], M.gridCC[:,2])
-     
-    area = getarea(h)
-    vol = getvol(h)
+
     #err = np.linalg.norm((divF-divF_anal)*np.sqrt(vol), 2)
     err = np.linalg.norm((divF-divF_anal), np.inf)
 
     if icount == 1:
-        print 'h       |   inf norm   | error ratio'        
-        print '---------------------------------------'                
+        print 'h       |   inf norm   | error ratio'
+        print '---------------------------------------'
         print '%6.4f  |  %8.2e  |'% (h1[0,0], err)
     else:
         print '%6.4f  |  %8.2e  |  %6.4f' % (h1[0,0], err, err_old/err)
-    err_old = err    
+    err_old = err