Merge branch 'dcip/spectralIP' of https://github.com/simpeg/simpeg into dcip/dev

Merge spectral IP stuff, and incorporate Lindsey's comments

SimPEG/EM/Static/IP/ProblemIP.py

@@ -89,7 +89,7 @@ class BaseIPProblem(BaseEMProblem):
                 dA_dmT = self.getADeriv(u_src, ATinvdf_duT, adjoint=True)
                 dRHS_dmT = self.getRHSDeriv(src, ATinvdf_duT, adjoint=True)
                 du_dmT = -dA_dmT + dRHS_dmT
-                Jtv += df_dmT + du_dmT
+                Jtv += (df_dmT + du_dmT).astype(float)
         # Conductivity ((d u / d log sigma).T)
         if self._formulation is 'EB':
             return -Utils.mkvc(Jtv)
@@ -180,13 +180,12 @@ class Problem3D_CC(BaseIPProblem):
 
         Make the A matrix for the cell centered DC resistivity problem
 
-        A = D MfRhoI D^\\top V
+        A = D MfRhoI G
 
         """
 
         D = self.Div
         G = self.Grad
-        # TODO: this won't work for full anisotropy
         MfRhoI = self.MfRhoI
         A = D * MfRhoI * G
 
@@ -313,11 +312,10 @@ class Problem3D_N(BaseIPProblem):
 
         Make the A matrix for the cell centered DC resistivity problem
 
-        A = D MfRhoI D^\\top V
+        A = G.T MeSigma G
 
         """
 
-        # TODO: this won't work for full anisotropy
         MeSigma = self.MeSigma
         Grad = self.mesh.nodalGrad
         A = Grad.T * MeSigma * Grad