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Why does matlab plot the unit step like a straight line?
Hi @Mark S System 1: s = tf('s'); sys1 = 1/s; % integrator system step(sys1) System 2: sys2 = zpk([], [...

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Minimization of cost function on MPC
Hi @Chandrakanth Pavanaskar You have a system model sys and I presume that you have written your own code for the ODE_solver to...

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How can i get smooth sine wave in MATLAB R2020b with any frequency.
Hi @Rohit To get a smooth sine wave, you are suggested to use this Sine Wave Function block: https://www.mathworks.com/help/...

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Implement these expressions in OCTAVE and plot on the same figure, the two functions: f=3t2 +2t-0.5 , g=2t cos(t) where the variable t varies from 0 to 10 with step 0.5.
@Jignasa, I typed exactly the same equations as you knowingly put on the description. But it gives error. Please check if the...

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PID Tune: Plant cannot be linearized
Hi @Arash Most likely your PV system has components that contain discontinuities. Thus, the Plant cannot be linearized. Howeve...

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State-Space Matrices
Hi @Aysel Alimirzayeva I added a simple example to show you. If you like this example, consider voting 👍 the Answer. Thanks! S...

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Plot step response of transfer function
Hi @Ye Ken Kok It is a input-output difference equation. Thus, you cannot use the continuous-time Laplace transform. Since the...

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tuning PID controller in simulink with actual hardware equipments
Hi @aakash dewangan If the transfer function is unknown, and the system is relatively simple, perhap the model-free extremum-se...

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Help with formulating conditional logic.
Hi @Jeffrey Lewis There are a few ways to do it. But since you have written the data into the code, I think probably the simple...

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State-Space Matrices
Hi @Aysel Alimirzayeva It's because of negative feedback. The LQR function only computes . Making a substitution

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runge kutta for 2 order ODE
Hi @Rio Bratasena Assuming that the symbol is the Dirac impulse. please check if the following responses are expected wh...

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Calculating system bandwidth using Function "bandwidth"
Hi @Alireza Aghdaei The function can distinguish from the input type. One requires a Dynamic System Model, the other requires a...

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how does matlab simulate electric field
Hi @abdullah Typically, the quiver() function can be used. You can also find a very good example on the simulation of Electri...

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Solve system of equations graphically
Alternatively, you can also do like this: Solve or plot this polynomial: x = -2:0.01:2; y = x.^4 - 6; plot(x, y), gr...

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What block is hydraulic/liquid on/off valve in Simulink?
Hi @Busuyi 2nd Edit: Based on your sketch, it should be a Gate Valve. https://www.mathworks.com/help/hydro/ref/gatevalve.html...

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i need help to find impulse response of system h(t) at time t
Hi @Rushit Bhavsar I used the impulse() method. but you can try using the expm() method. Look up the example and verify with th...

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Does the fuzzy inference system (Mamdani) use Forward Chaining or Backward ?
Hi @Sarah IF you understand that the Fuzzy System provides means of reasoning by inference in order to decide the truthness of ...

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Can anybody give me the idea for implementing PID control for dc motor using state space equations through ode45 solver?
@MOHAMED ASWER Not sure how your DI/dc motor system, but I think the following example should give you the basic idea. tspan ...

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Find AIC, AICc, BIC for ODE system
Hi @TrevorR You can try using this command [aic, bic] = aicbic(). For more info, please check: https://www.mathworks.com/help/...

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How can I obtain the State space from the Mass,stiffness,damping matrices
Hi @aiman If the matrices are known, then you can apply these formulas: A = [zeros(n) eye(n); M\K M\C]; % to get the State...

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How to tune PID controller from time constant and static gain?
@Bruno Araujo, Not sure if you are looking for some manipulations like this: Kp = 72.402; Tp = 639.24; Gc = pid(Kp) Gf = tf(...

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Cost function to minimize variance of error
@Rishabh Pachchhao, Since you didn't provide info about your system. here is an example that you can study. However, I don't t...

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How to solve this equation
@Raef, you are a good son and took up a filial duty to help your father. n = 1; y0 = 1; % intial value F = @(t, y) - (1...

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Can anyone help understand what the blocks in this figure are and where to find them in Simulink library?
Hi @Busuyi If you compare with the generic symbols in a Piping and Instrumentation Diagram (P&ID), they are manual-operated Gat...

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Find the local and global maxima and minima for the function (x+1)^2/(1+x^2) x belongs to [-5,5].Showing local min value something different than zero and how get local values
@Aashay, your code works. So, what exactly is the question for the math problem? syms x f(x)=(x+1)^2/(1+x^2); I=[-5,5]; fl(x...

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Fossen's dynamic AUV model implementation
Hi @John Terry You can follow a few examples on this link and apply the [V, S] = odeToVectorField(eqns) command. https://www.m...

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Solving a State Space Model using Runge Kutta method, Mid Point or Heun Method to view system response
Hi @Anas Rehman If you still keep the old versions of MATLAB (R2012 and older), you can find the requested ODE solvers in the l...

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Using fminsearch and then using the output of fminsearch in cost and ode function.
Maybe like this: [lambdas, cost] = fminsearch(@Q1_cost, -100) [interval, sol] = ode45(@Q1_ode, [0 10], [0.5 lambdas]); plot(i...

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How can I obtain a equation from my fuzzy or ANFIS model done using tool box?
Hi @Lilly Mercy and @Tony Castillo Not sure if this simple example really answer the queries for a 5-input, 1-output system. He...

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having trouble optimizing a NPV
Hi @jxl The function tsk(r) seems to be converging asymptotically to zero as . r = linspace(0, 1000, 10001); plot(r, tsk(r)),...

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