def getA(self, tInd):
        dt = self.timeSteps[tInd]
        return self.MfMui*self.mesh.edgeCurl*self.MeSigmaI*self.mesh.edgeCurl.T*self.MfMui + (1.0/dt)*self.MfMui
Initialize bit bang (or software) based SPI.  Must provide a BaseGPIO
dataset/ETHPy150Open simpeg/simpeg/SimPEG/EM/TDEM/TDEM_b.py/ProblemTDEM_b.getA--crossover with--dataset/ETHPy150Open adafruit/Adafruit_Python_GPIO/Adafruit_GPIO/SPI.py/BitBang.__init__