MATLAB: Error simple program PID

pid error

Hello, I doing a pid project I have everything correct but this error come up what I should do?

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in my second compute it works, however I dont know how to find the tooboxes

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MATLAB: How to develop simulink model using this code

Take a look at a few "getting started" videos for Simulink - you can find them here .

Also, check out videos and examples on PID Control with MATLAB and Simulink page.

MATLAB: How to extract values of Kp, Ki, Kd and D of a PID transfer functio

s=tf('s');
PID=(29.24)+(15.51/s)-(840.334/(s+35))
syms Kp Kd Ki N
NPID_num=[Kp+N*Kd Kp*N+Ki N*Ki];
NPID_den=[1 N 0];
eqn1=PID.Numerator{1}(1)==NPID_num(1);
eqn2=PID.Numerator{1}(2)==NPID_num(2);
eqn3=PID.Numerator{1}(3)==NPID_num(3);
eqn4=PID.Denominator{1}(2)==NPID_den(2);
solx=vpasolve([eqn1 eqn2 eqn3 eqn4]);
Kp=subs(Kp,solx.Kp)
Kd=subs(Kd,solx.Kd)
Ki=subs(Ki,solx.Ki)
N=subs(N,solx.N)

What I did is a simple equation solving. I defined the unknown parameters as symbolic and then obtain the numerical values with the vpasolve function. Note that at the end, the symbolic controller parameters are replaced with their numerical values. After that, in the PID Controller block in Simulink, write Kp, Ki, Kd and N to the parameters repsectively. Hope this helps.

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MATLAB: How to develop simulink model using this code

MATLAB: How to extract values of Kp, Ki, Kd and D of a PID transfer functio

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