Let us consider the model shown in Figure 2.4 where K1 = 3 + j1 and K2 = 4 + j3 and these values have been specified in MATLAB's Command Window. Upon execution of the Simulation start command, the sum of these two complex numbers is shown in the Display block.

Figure 2.4: Display of the sum of two complex numbers for Example 2.2

Next, let us delete the block with the K2 value and execute the Simulation start command. The model is now shown as in Figure 2.5.

Figure 2.5: Model for Example 2.2 with Block K2 deleted.

Now, let us add the Ground block at the unconnected input of the Sum block and execute the Simulation start command. The model is now shown as in Figure 2.6.

Figure 2.6: Model of Figure 2.5 with a Ground block connected to the Sum block