MATLAB CONTROL SYSTEM TOOLBOX 9 Guide de l'utilisateur télécharger pdf (Page 611)

100

101

step

11-221

All systems must have the same number of inputs and outputs b ut may

otherwise be a mix of continuous- and discrete-time systems. This syntax is

useful to compare the step responses of multiple s ystems.

You can also specify a distinctive color, linestyle, and/or marker for each

system. For example,

step(sys1,'y:',sys2,'g--')

plots the step response of sys1 with a dotted yellow line and the step response

sys2 with a green dashed line.

When i nvoked with output arguments,

[y,t] = step(sys)

[y,t,x] = step(sys) % for state-space models only

y = step(sys,t)

return the output response y, the time vector t used for simulation, and the

state trajectories

x (for state-space models only). No plot is drawn on the

screen. For single-input systems,

y hasasmanyrowsastimesamples(length

t), and as many columns as outputs. In the multi-input ca se, the step

responses of each input channel a re stacked up along the third dimension of

The dimensions of

y are then

and

y(:,:,j) gives the response to a unit step command injected in the jth

input channel. Similarly , the dimensions of

x are

Example Plot the step response of the following second-order state-space model.

length of

t()

number of outputs

()

number of inputs

()××

length of

t()

number of states

()

number of inputs

()××

1 2 ... 606 607 608 609 610 611 612 613 614 615 616 ... 648 649

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MATLAB CONTROL SYSTEM TOOLBOX 9 Guide de l'utilisateur Page 611

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