# Step Response of Transfer Function

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Ainars Cernavskis le 20 Jan 2022
Commenté : Rena Berman le 27 Nov 2023
Hello so am trying to plot the step response of this trasnsfer function , but am not really sure how do i need to write it down in den = part , any help would be great thanks. .
t=0:0.01:5;
num = 1;
den = [1 2 17];
sys = tf(num, den);
y = step(sys,t);
plot(t,y*4)
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Sam Chak le 23 Nov 2023
The original question may be beneficial to people who wish to learn how to plot the step response.
Rena Berman le 27 Nov 2023

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### Réponse acceptée

Yongjian Feng le 20 Jan 2022
Modifié(e) : Yongjian Feng le 20 Jan 2022
Get help by doing:
help tf
Basically, you need to expand the denominator given in image into polynomial of s. Then take the coefficients and put into den. For example, if you expand it into 2*s^2+5*s+10, then den = [2 5 10].
To expand the denominator, you can do it manually or you can use the expand function of matlab.
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