To get a proper matrix definition, at least one Ground node should be specified in the model. This is particularly important as the Stationary Source Sweep does not add any constraint on the electric potential.
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If the Generate default plots check box on the Study node is enabled, default Global Matrix Evaluation nodes for matrix output are generated.
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For 3D models involving the Electrostatics, Boundary Elements physics, direct solvers scale poorly with problem size so some caution is recommended.
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