www.gusucode.com > control 案例程序 matlab源码代码 > control/ResponsefromInitialConditionsExample.m
%% Response from Initial Conditions % This example shows how to compute and plot the response of a state-space % (|ss|) model to specified initial state values using |initial|. %% % Load a state-space model. load ltiexamples sys_dc sys_dc.InputName = 'Volts'; sys_dc.OutputName = 'w'; sys_dc.StateName = {'Current','w'}; sys_dc %% % This example uses the SISO, 2-state model |sys_dc|. This model represents % a DC motor. The input is an applied voltage, and the output is the % angular rate of the motor ω. The states of the model are the induced % current $i$ (|x1|), and ω (|x2|). The model display in the command % window shows the labeled input, output, and states. %% % Plot the undriven evolution of the motor's angular rate from an initial % state in which the induced current is 1.0 amp and the initial rotation % rate is 5.0 rad/s. x0 = [1.0 5.0]; initial(sys_dc,x0) %% % |initial| plots the time evolution from the specified initial condition % on the screen. Unless you specify a time range to plot, |initial| automatically % chooses a time range that illustrates the system dynamics. %% % Calculate the time evolution of the output and the states of |sys_dc| % from $t$ = 0 (application of the step input) to $t$ = 1 s. t = 0:0.01:1; [y,t,x] = initial(sys_dc,x0,t); %% % The vector |y| contains the output at each time step in |t|. The array % |x| contains the state values at each time step. Therefore, in this example % |x| is a 2-by-101 array. Each row of |x| contains the values of the two % states of |sys_dc| at the corresponding time step.