def MfRhoIDeriv(self,u):
        return self.mesh.getFaceInnerProductDeriv(self.curModel.rho, invMat=True)(u) * self.curModel.rhoDeriv
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dataset/ETHPy150Open simpeg/simpeg/SimPEG/EM/Base.py/BaseEMProblem.MfRhoIDeriv--crossover with--dataset/ETHPy150Open steveniemitz/scales/scales/observable.py/Observable.Subscribe