Zeigler-Nichols reaction curve

Hello so am trying to find a Zeigler-Nichols reaction curve but every time when i run the command i get an error and i dont know how to fix it ,any help would be great

t=0:0.01:3.0;

opensys=tf(5,conv[1,18,89,87]);

y_opensys=step(opensys,t);

plot(t,y_opensys);

Answer 1

[Mathieu NOE]

hi

probably you wanted to do this :

t=0:0.01:3.0;
opensys=tf(5,conv([1 18],[89 87]));  
y_opensys=step(opensys,t); 
plot(t,y_opensys);

[Mathieu NOE]

hello

problem solved ?