The positivity condition on the inductances , , , , and , as well as a positive definiteness condition on the matrix
gives, as optimal choices of the parameters and ,
A modified MDKC is shown at top in Figure 5.26, where velocities are treated as currents, and stresses as voltages; as such, the coupled inductance in Figure 5.25 has become a coupled capacitance. This network may be discretized in a way very similar to the network for Maxwell's Equations, as described in §4.10.6. Under the spectral mappings defined by (4.112) (with step sizes of , ), the connecting LSI two-ports decompose into series/parallel connections of multidimensional unit elements. The one-port inductances and capacitances, as well as the coupled capacitance are discretized using the trapezoid rule, with a step size of . The resulting multidimensional DWN is shown at bottom in Figure 5.26, and the interleaved computational grid in Figure 5.27 (which is very similar to the grid for the DWN for Maxwell's Equations, as shown in Figure 4.55).