Sam Chak
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Accept 5 answers given by other contributors
Awarded to Sam Chak on 10 Oct 2023
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Content Feed
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.
17 hours 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...
18 hours ago | 1
| accepted
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 ...
2 days ago | 0
| accepted
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...
2 days ago | 0
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 ...
3 days ago | 0
Unable to perform 'TF2SS" operation
Rename the script file with a different name, for eample, 'convertTF2SS.mlx'. which tf2ss -all
3 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...
4 days ago | 0
| accepted
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 ...
4 days ago | 0
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...
5 days ago | 1
| accepted
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 ...
5 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...
7 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 ...
7 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...
8 days ago | 0
| accepted
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 ...
8 days ago | 0
| accepted
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...
8 days ago | 0
| accepted
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...
9 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...
9 days ago | 1
| accepted
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...
11 days ago | 0
| accepted
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...
11 days ago | 1
| accepted
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 ...
12 days ago | 0
Writing a function that accepts input argument that is one of 3 things
Hi @Kyle Weaver The assignment typically requires designing the Flow of Execution before starting to write the code, but it doe...
12 days ago | 1
| accepted
need help with state space input error
Hi @Ossama You have entered the input matrix B as a single column vector, causing a dimension mismatch. Consequently, the state...
12 days ago | 0
Solving a system of differential equations with a variable stored in an array
Hi @Mahima In addition to the standard integration methods suggested by @Star Strider and @Torsten, you can solve the SIR model...
13 days ago | 0
Recursive modeling in Simulink
Hi @Yannick Ongena If the population model can be represented as a discrete state-space system, then the appropriate approach w...
14 days ago | 1
| accepted
How Approximate Model FOPDT
Hi @LORIS IACOBAN Considering that the open-loop model lacks the characteristic S-shaped process reaction curve and exhibits os...
14 days ago | 0
I need help finding PM and GM for this system.
Hi @marko rois If you know the dynamic system 'sys', which is commonly described using modeling commands like as tf(), zpk(), a...
14 days ago | 0
| accepted
Why do I Receive this error: Error using odearguments ODES_LIN must return a column vector.
Hi @Maureen It seems that you intend to generate the exogenous disturbance and noise signals as the sum of sine waves. Specific...
14 days ago | 0
a nonlinear system and its control input in simulink
Hi @controlEE While I cannot evaluate the MATLAB code from the image, it seems that in Equation (6) represents a definite inte...
16 days ago | 0
| accepted
How do I sort the issue of infinite derivative of a state in a PI controller?
Hi @K. Amrit When solving differential equations in Simulink, it's important to prevent the state from going haywire. Consider ...
18 days ago | 0
İ wrote a code but idk if its correct can u check it
Hi @Bünyamin Bora The formulas are generally correct. However, there is a technical issue worth considering. Have you ever wond...
18 days ago | 0
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