def MfRhoIDeriv(self,u):
        return self.mesh.getFaceInnerProductDeriv(self.curModel.rho, invMat=True)(u) * self.curModel.rhoDeriv
Derivative of :code:`MfRhoI` with respect to the model.
dataset/ETHPy150Open simpeg/simpeg/SimPEG/EM/Base.py/BaseEMProblem.MfRhoIDeriv