SimPEG.electromagnetics.frequency_domain.Simulation3DMagneticFluxDensity.getA# Simulation3DMagneticFluxDensity.getA(freq)[source]# System matrix \[\mathbf{A} = \mathbf{C} \mathbf{M^e_{\sigma}}^{-1} \mathbf{C}^{\top} \mathbf{M_{\mu^{-1}}^f} + i \omega\] Parameters freq (float) – Frequency Return type scipy.sparse.csr_matrix Returns A