update the value of k in the numerator

Question

jose luis guillan suarez 2018-5-8

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回答： Walter Roberson 2018-5-8

i want to create a transfer function with num=[k*30] and den=[1 1 6 8] and k=1. But I need to change the value of k and it is automatically updated in the num. How can i do?

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Answer 1

Star Strider 2018-5-8

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Create an anonymous function from the tf function call:

Example —

s = tf('s');
h = @(k) tf(k*30, [1 1 6 8]);
for k = 1:3
    sys = h(k)
end
sys =
            30
    -------------------
    s^3 + s^2 + 6 s + 8
Continuous-time transfer function.
sys =
            60
    -------------------
    s^3 + s^2 + 6 s + 8
Continuous-time transfer function.
sys =
            90
    -------------------
    s^3 + s^2 + 6 s + 8
Continuous-time transfer function.