I want to find two missing parameters in an ODE system of equations using regression/optimization in MATLAB
Hi @naiva saeedia The system identification task at hand seems to be quite challenging, as you only have two parameters to mani...

17 days ago | 0

How do I optimize solutions of ODE?
Hi @Amito Usami-san Considering your objective of varying the force input 'Fc', it becomes necessary to create a Gain Schedule ...

17 days ago | 1

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solve differential equations use bvp4c
Hi @lvlv sun Add these two lines to code as shown below to get the desired number of points for the solution. numpts = 5; ...

17 days ago | 0

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hi.I have problem in spacecraft dynamic control simulation.
Hi @ali.heydari I renamed the ODE function to 'odefcn()' because 'ode' is a built-in function introduced in the R2023b release....

18 days ago | 0

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How can i pass S-curve through the center of a circle ??
Hi @Dr Sohaib Khan Check if the following is the desired 3D line plot? t1 = (0:pi/100:pi); % Top curve 0 to 180 deg t2 = (-p...

18 days ago | 0

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a nonlinear system and its control input in simulink
Hi @controlEE, If you define solely as a continuous-time function, it would appear as displayed in Figures 1 and 2. h = 2; ...

18 days ago | 1

Minimize the sum of squared errors between the experimental and predicted data in order to estimate two optimum parameters
Hi @Vikas Meena Taking into account the information provided, this solution is likely the most suitable option I can propose. ...

18 days ago | 0

Need Help with Position, Velocity, Acceleration model
Hi @Sinan When modeling a differential equation in Simulink, it is generally necessary to formulate the problem in integral for...

19 days ago | 0

i want to get the overall transfer function of the parallel conncected transfer functions blocks
@deekshith, Oh I see. Because you left the spaces. Either you ensure no spaces, or place commas (,) between the elements.

20 days ago | 0

i want to get the overall transfer function of the parallel conncected transfer functions blocks
Hi @deekshith, Check if this works for you. %% Transfer function 1 num1=[576 288]; den1=[4.8 34.992 73.392 1504.8]; G1 = tf...

20 days ago | 1

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Matlab is giving different answers for the same calculation
Hi @Stephen The discrepancy observed can be attributed to numerical precision errors introduced by humans. The scripted answer ...

21 days ago | 0

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ODE45 and dsolve result difference
The order of the state variables between and is swapped in the symbolic approach. syms v(t) y(t) w(t) z(t) % Parameter k1...

21 days ago | 1

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error bar in curve fitted graph
Use errorbar(). x = (-1:0.1:1)'; y = asinh(x/0.5); f = fit(x, y, 'poly1') err = y - f(x); errorbar(x, y, err), hold ...

22 days ago | 0

Unable to perform 'TF2SS" operation
Rename the script file with a different name, for eample, 'convertTF2SS.mlx'. which tf2ss -all

22 days ago | 0

Optimization Problem for 3-Element Windkessel Model. Need help with improving my optimization and looking for better optimization alogrithims.
Hi @Hussam In my solution, I suggested utilizing the dI/dt-free model: This approach enables me to directly utilize the ra...

23 days ago | 0

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icare function doesn't return the value for X_lqr, K_lqr.
OP: I don't know why, but L_lqr(9x1) matrix's components are all complex number. The description in icare() documentation says ...

23 days ago | 0

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Plug Flow Reactor with axial dispersion ODE (error)
Hi @Cai Li Song There doesn't seem to be any coding issue with the 2nd-order ODE 'dX_CH4dz' when I substituted all parameters w...

24 days ago | 1

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how to transfer a simulink model from the old version to the new version
If you're already using MATLAB/Simulink R2024a, you should be able to open the previously saved slx or mdl file from the R2014a ...

24 days ago | 0

DIfferences on Sloped field using 'dsolve' and 'ode45'
Hi @Athanasios Paraskevopoulos The reason for obtaining different results is due to the selection of an incorrect initial value...

26 days ago | 1

Optimization Problem for 3-Element Windkessel Model. Need help with improving my optimization and looking for better optimization alogrithims.
Hi @Hussam I also haven't been able to obtain a better identified system for the 3-element Windkessel Model. However, it would ...

26 days ago | 0

Why am I not able to get desired output of -40V.
Hi @ChoonHan I have constructed a full-order state observer in Simulink based on the information you provided, and it yields th...

27 days ago | 0

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How to plot a phase portrait using Runge-Kutta for a system of ODEs?
Hi @Iris Are you expecting the followng Phase Portraits? odefcn = @(t, y) [y(2); % y' = z ...

27 days ago | 0

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Hi, anybody ever done a simulation on a quarter car model suspension system to analyze the vehicle behavior when encountering a speed bump?
Hi @sadat golz I wanted to bring to your attention that it seems you accidentally deleted the graph that you had attached yeste...

27 days ago | 0

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Matlab showing 0 instead of small value
Hi @Ismita When examining the flow of execution, you will notice that the 'pressure_CGS' vector is initialized with twenty-four...

28 days ago | 0

Hello, I would like to model my equation by Matlab Simulink
Hi @Zaid Typically, those who primarily work with pure Python may encounter difficulties when learning to use Simulink at the b...

28 days ago | 1

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How to use lqr for R=0?
Why would you want to set the input-weighted matrix R to zero? If you set R to zero in the LQR control gain design, it means...

30 days ago | 0

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step response in 3 scenarios: setting the initial reference voltage, shifting to another output voltage level
Hi @mostafa jabbari Please note that only the first two stages can be simulated since it's unclear through which channel the di...

30 days ago | 1

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I am trying to solve a system of three differential equations simultaneously
Hi @Erin Summerlin-Donofrio The third differential equation can be rearranged conveniently, allowing all three state equations ...

1 month ago | 0