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Sam Chak


Last seen: Today |  Active since 2020

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Have successfully used ode45 once in this code, but with the same size parameters am getting an error about initial conditions vector being longer than the return vector.
Hi @Raoul There is no error in organizing the code structure clearly with constants and states (variables that change over time...

9 hours ago | 0

Answered
Controllable Companion form for a MIMO system
Hi @naiva saeedia The following is the result returned by compreal: %% Original state-space Plant A = [-0.978707531551846 ...

6 days ago | 0

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Initial Oscillations in Closed Loop Control Model
Hi @Mariangela Plot the vector field, and you should be able to understand the instantaneous dynamics at each point in the phas...

9 days ago | 0

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PID tuning to meet conditions for settling time and overshoot while a stable system with minimum peak time and zero velocity error.
Hi @Ashaya KC Here is the solution using pidtune(). There is no direct way to input the desired settling time and overshoot per...

9 days ago | 0

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Answered
PID tuning to meet conditions for settling time and overshoot while a stable system with minimum peak time and zero velocity error.
Hi @Ashaya KC Let's first use the ideal mathematical solution and then compare it to your solution obtained using the pidtune()...

9 days ago | 0

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having problem plotting ramp function
Hi @Tien Yin The signal in the image is a piecewise function that consists of three sub-functions defined over different interv...

9 days ago | 1

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How to add an s+1 block on simulink?
Hi @Julian Since you are unable to clearly define the control objective and performance requirements, I can only advise you to ...

19 days ago | 0

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Optimization Eigenvalue problem Stiffness matrix
Hi @Marina The problem has two parts. I have solved only the first part for you, which is to determine the characteristic polyn...

2 months ago | 0

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Turning powers of hyperbolic functions to multiple arguments
Hi @Andrew At first, I thought you were describing the sum of arguments. This is certainly not a silly question. However, it re...

2 months ago | 1

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how can I calculate euler constant
Hi @hajer Three days ago, @John D'Errico and I discussed the Gamma function in this thread. I’m not sure how to perform the num...

2 months ago | 2

Answered
make the execution faster
Hi @prabal datta You might as well use the built-in ODE solver, such as ode45, to solve the chaotic Lorenz system for compariso...

2 months ago | 1

Answered
The Newton Raphson method for p(x) = 100 .* sqrt(x) .* 0.99.^(sqrt(x)) - 0.5 .* x, problem with derivative and reasonable x value
Hi @Elina You likely want to find the value of where the maximum value of occurs, but you may have inadvertently used the New...

2 months ago | 0

Answered
finding altitude using matlab atmosisa given pressure
Hi @Irfan You can use this minimization approach. altitude = ga(@costfun, 1, [], [], [], [], 3.9e3, 4e3) %% Check result [~,...

2 months ago | 0

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Answered
PID controller behaves strangely for larger Ts values
Hi @Wynand There are a few things for which you can find detailed explanations in control theory books. In short, the ideal ITA...

2 months ago | 1

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How do I solve this differential equation?
Put the constants inside the function. tspan = [0, 1e-3]; y0 = [0.139626; 0]; [t, y] = ode45(@(t,y) odefcn(t,y), tspa...

2 months ago | 1

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Answered
How to do this block diagram in simulink?
Hi @Tahsin If you are referring to this block diagram, there is a slight mistake in the architecture, as the Velocity Loop and ...

2 months ago | 0

Answered
How to properly fit the data to lorentzian curve as I am getting a few errors...
Hi @Yogesh Here is the fitting with a Gaussian model. RMS=[]; R=[]; P_threshold=[]; L=5; %[m] Fiber length V1=[1]; P0=4.7...

2 months ago | 0

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PI controller does not have the effect I would expect from the calculations
Hi @Wynand Please see my explanations below. %% Plant K = 11041666; B = 100; M = 1019; num ...

2 months ago | 0

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Answered
What calculation is done to find the gains (k) of the zpk function?
Hi @Rafaella Barrêto Campos Short Answer: Due to your specific state-space configuration, k(1) is derived from the first elem...

2 months ago | 0

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Model and control state space with perturbation
Hi @CN. The discussion in the provided link does not address control design for disturbance rejection. Regarding your inquiry,...

2 months ago | 0

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Trying to create a polynomial using data from a table
Hi @Andrei I believe the correct syntax should be [X, Y] = meshgrid(dP, PressureInlet), and the remainder of your code appears ...

2 months ago | 0

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What optimization algorithm would work best for my network problem?
Hi @Robert Gray It may be difficult to determine which optimization algorithm would work best for your network problem. Some op...

2 months ago | 0

Answered
How to properly fit the data to lorentzian curve as I am getting a few errors...
Hi @Yogesh Here is how I fit the Lorentzian model: RMS=[]; R=[]; P_threshold=[]; L=5; %[m] Fiber length V1=[1]; P0=4.7960...

2 months ago | 0

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Answered
Controlling the actuator with 5,10 mm displacement input.
Hi @Fatih The mathematical function for the reference signal (red curve) is necessary so that we can instruct the PID controlle...

2 months ago | 0

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function zpk and linmod
Hi @Rafaella Barrêto Campos Once you have the state-space, you can apply the zpk() function to obtain the TF in zpk mode. A ...

2 months ago | 0

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I am using the MATLAB exchange file called "A MATLAB Script for Earth-to-Mars Mission Design", getting error sunscreen is not defined
Hi @Chintan Most of the simulation projects by David Eagle require SNOPT, which stands for Sparse Nonlinear OPTimizer. If you a...

2 months ago | 1

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Answered
How to define the output membership function in Sugeno method while using Fuzzy Logics Design app in Matlab?
Hi @Tharun Balaji Rangaswamy Selvakumar If you have a set of data, you can train the ANFIS, which produces the Sugeno Fuzzy Sys...

2 months ago | 0

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Dimensionless variables of the differential equation
Hi @Yu The aim is to render the entire dynamical system dimensionless (by finding the dimensionless time derivative), rather th...

2 months ago | 0

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Answered
Is there a way to determine an equivalent circuit for Nyquist diagrams (I have the data set) using Matlab (or Simulink)?
Hi @Arthur FdA I'm unfamiliar with your circuit system. However, if you have the data in the form of frequency-response, then y...

2 months ago | 2

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for the parameter space in fuzzy logic , how can i choose the value of the numbers ?
Each selected membership function type requires the parameters to be specified as a vector. The length of the parameter vector d...

2 months ago | 0

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