MATLAB CONTROL SYSTEM TOOLBOX 9 Especificações descarregar pdf (Página 556)

100

101

step

16-216

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

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

useful to compare the step responses of multiple systems.

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 invoked 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 case, the step

responses of each input channel are 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

()××

0.5572– 0.7814–

0.7814 0

11–

1.9691 6.4493

1 2 ... 551 552 553 554 555 556 557 558 559 560 561 ... 590 591

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