How to find steady-error value from the response graph? is there any command to find the steady state error from the response graph?
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G(s)=5/s^2+2s+25
1 Comment
SARATHRAJ V
on 13 Feb 2022
s = tf('s');
sys=input('enter the funtion' );
[y,t]=step(sys);
y(length(y))
plot(t,y);
xlabel('Time (sec)');
ylabel('Amplitude');
title('step responce');
Answers (4)
Arkadiy Turevskiy
on 26 Nov 2014
Edited: Arkadiy Turevskiy
on 26 Nov 2014
Your question is not formulated clearly. Did you mean steady-state value, not "steady-error value"? Assuming that's what you meant, the next clarification is steady-state value of a transfer function in response to what - is it in response to a step input?
If that's what you meant, then yes, you can do this like that:
>> s=tf('s');
>> sys=5/(s^2+2*s+25);
>> [y,t]=step(sys);
>> y(length(y))
ans =
0.20
You can also right click on a step plot, "Charecteristics", "Steady-state", as shown below:
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/176904/image.jpeg)
4 Comments
Arkadiy Turevskiy
on 14 Jun 2024
My answer above us using Control System Toolbox.
To get a step plot in MATLAB do this:
s=tf('s');
sys=5/(s^2+2*s+25);
step(sys);
Miswar Syed
on 8 Apr 2020
SP=5; %input value, if you put 1 then is the same as step(sys)
[y,t]=step(SP*sys); %get the response of the system to a step with amplitude SP
sserror=abs(SP-y(end)) %get the steady state error
3 Comments
Catherine Callaghan
on 6 Feb 2021
What would I set SP to if I wanted to represent a ramp input and parabolic input? Thanks.
Ur rehman Waheed
on 16 Apr 2020
matlab command to find steadt state error from step response graph in matlab
>> sserror=(SP-(y1.data(end,end)))
where SP value is one when input is step input. y1 shows workspace value of step response. normally it comes during simulation from simulink.
1 Comment
Josh McNamara
on 19 Oct 2020
Hi ,
Is there anything simular using 'lsim' command for a ramp input?
Regards,
Josh
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