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%% Time-Domain Responses of Multiple Models % This example shows how to compare the step responses of multiple models % on a single plot using |step|. This example compares the step response of % an uncontrolled plant to the closed-loop step response of the plant with % two different PI controllers. You can use similar techniques with other % response commands, such as |impulse| or |initial|, to obtain plots of % responses of multiple models. %% % For this example, obtain two models whose time responses you want to % compare, and plot them on a single step plot. For instance, you can % compare a third-order plant |G|, and the closed-loop response of |G| with % a controller |C1| having integral action. G = zpk([],[-5 -5 -10],100); C1 = pid(0,4.4); CL1 = feedback(G*C1,1); step(G,CL1); %% % When you provide multiple models to |step| as input arguments, the command % displays the responses of both models on the same plot. If you do not % specify a time range to plot, |step| attempts to choose a time range that % illustrates the dynamics of all the models. %% % Compare the step response of the closed-loop model with another controller. % Specify plot colors and styles for each response. % C2 = pid(2.9,7.1); CL2 = feedback(G*C2,1); step(G,'b--',CL1,'g-',CL2,'r-') %% % You can specify custom plot color and style for each response in the plot. % For example, |'g-'| specifies a solid green line for response |CL2|. For % additional plot customization options, use |stepplot|.