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# Sam Chak

Last seen: en dag ago Active since 2020

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'Matlab says that the problem is at (t), i want to use ode45
Hi @Eleftherios Guess you probably want to view the Lorenz attractor. [t, x] = ode45(@odefun, [0 100], [1 1 1]); plot3(x(:,1)...

ungefär 7 timmar ago | 0

Matlab R2022a: How to obtain the predicted values given the training and test observations with the neuro-fuzzy method?
Hi @jamal numan "data" was in your evalfis() but the one in the Workspace is "Data". Also, the syntax is now because Input arg...

ungefär 16 timmar ago | 1

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MATLAB doesn't plot my function
Hi @Pedro Almeida You probably want to plot like this? y = @(x) - sin(x); z = @(x) x.^2; fun = @(x) y(x) - z(x); ...

en dag ago | 2

Comparisons of numerical solution methods
Hi @Enrico Incardona, Here is the comparison between the solution by ode45 and the solution by Forward_Euler. As mentioned pre...

en dag ago | 0

Error using fmincon Supplied objective function must return a scalar value
HI @SWASTIK SAHOO The error message says that your objective function "myfunc()" must return a scalar value. Perhaps the trapz(...

en dag ago | 0

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Second order differential equation with large matrices
Hi @David Togonidze SInce this is a linear system, if you have the Control System Toolbox, then you can manipulate the matrix d...

2 dagar ago | 2

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Control System Steady State Error for VTOL
Hi @Abdul Rahman Alam The transfer function between the error signal and the input signal is defined by where is the clos...

2 dagar ago | 1

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How can i calculate the PI controller gains from my plant transfer function
Hi @Mads Olesen You can try this. But use a small combination pool. From the previous simulations, it seems that Kp has a mor...

3 dagar ago | 0

Inputting a time varying equation into system in simulink
Hi @Reed Smith Edit #2: As suggested in my original Answer, you can use the Clock to generated the time t vector, so that you c...

3 dagar ago | 1

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differential equations matlab with 2 equations with changing values dependent on each other
Hi @Brennah Not exactly sure what to do dxe2 = diff(dxe). But from the given ODEs, they can be solved to obtain and . You can...

5 dagar ago | 0

how to derivate an equation of x and y without taking any variable constant?
Hi @Ahmed Mujtaba It can be confusing because the math structure of y/1 - x - cos(y) is legitimately interpreted as . Guess y...

5 dagar ago | 0

Halley's method
Hi @Vivian Ho It is recommended to show your working and efforts in solving the problem. But if you are having trouble, then yo...

6 dagar ago | 0

How to use the matlab to predict the properties price given some observations using fuzzy logic (FL)?
Hi @jamal numan Generally, you need to collect data about the past and current state of the Property Prices in a region and its...

6 dagar ago | 1

Lyapunov stability analysis function
Hi @Lydia Abigail Garza Coello As far as I know, there is no built-in function.m in MATLAB for directly performing the Lyapunov...

6 dagar ago | 0

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How to identify negative slope from plot data?
Hi @Michael Tognotti This is just a basic idea for identifying the region of negative slope. Generally, the numerical different...

6 dagar ago | 0

How can i calculate the PI controller gains from my plant transfer function
Hi @Mads Olesen Perhaps you can directly insert the PI controller and obtain the closed-loop response. Tune the gains if not go...

7 dagar ago | 1

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Derivative of state '3' is not finite.
Hi @younwook song The system is unstable. It is rather difficult to decipher the dynamics from the displayed block diagram and ...

7 dagar ago | 0

I want help solving differential equations
Hi @kubel Follow the example in the dsolve() documentation https://www.mathworks.com/help/symbolic/dsolve.html syms x(t) eq...

7 dagar ago | 0

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Plot several solution curves to y'(t) = y(t) - t
Hi @Carla Roos You can create an anonymous function of t and y. fun = @(t, y) y - t; % <--- Type like this % solve f...

7 dagar ago | 0

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How to import my state space Modell into Simulink
Hi @Ann-Christin Schlupek You will need to import the identified model from the MATLAB workspace into Simulink. Follow the step...

8 dagar ago | 0

Closed-loop parameters identification
Hi @Andrea Carlo Giorgio Gottardini I see. You need the mathematical model to perform tuning on the PID. Since the Simulink mod...

8 dagar ago | 0

is there any way to train a model to learn a matrix and all variables in it then generate same matrix
Hi @hessam asadi The answer is generally yes, it is possible to train so long as it is a non-singular (invertible) matrix. Fir...

8 dagar ago | 0

Why the controller block diagram is not working (while tracking the reference and water level in tank 2 at specific level)?
Hi @Sana Mohamed It seems that your equation for causes the level of Tank #2 to dip below 0, thus term sqrt(x(2)) returns an ...

8 dagar ago | 0

defining state matrix as anonymous function
Hi @Nicole The input should be defined for in order for the anonymous function to work properly in MATLAB. % parameters m ...

8 dagar ago | 0

2-DOF Damped Unforced System. Finding Natural Frequences/Damping ratios. Receptance Matrix.
Hi @Nikolaj Gatijatullin I don't have sufficient knowledge about System 2 (2-DOF). If you can show how you normally use Mathema...

10 dagar ago | 0

Plot step response for control signal (u1 u2 ...) in a MIMO system with feedback
Hi @Cesar Adolfo Cruz Vargaya The original plant is a coupled 2nd-order MIMO system. If the desired closed-loop transfer functi...

11 dagar ago | 0

PID implementation using code
Hi @Sanjeet Kulkarni Wouldn't it be simpler if you obtain the signal directly from the Integrator block, and then feed it into...

13 dagar ago | 0

Optimizing simulink parameters from matlab code
Hi @Jasmin Falconer Put it another way around, you can fminunc() to directly optimize the gains from the Simulink model and th...

13 dagar ago | 0