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how to solve a 4 DOF problem with data input force
Hi @LUCA PATRIARCHI Since the earthquake force is externally time-dependent (different step size from the solver), I have creat...

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How to draw square plot in matlab?
Hi @Nilanshu Mahant Here is the basic to draw a square or any rectangular object. The rectangle function will pick a corner at ...

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Calculation of Electric Field for the given two point charges.
Hi @ajskfd Better ask a physics teacher or a physicist to check. The electric field at for the first positive Charge ...

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question related to direction field
Hi @SSBGH The solutions for the initial conditions, , , and are given by , , , respectively. The direction field for ca...

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ode45 code runs indefinitely
Hi @Thomas Laverick The pressure drops rapidly. So, by the time sec. If you look at the 6th equation (dPdw), you will notice...

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Solving Differential Equations With
Hi @Igor Braz Gonzaga If this is an exercise in the Mechanics class, usually will be given. Anyhow, there are generally 3 case...

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How do I get distance between two curves that cannot be described with a polynomial?
Hi @Jacinth Gudetti Here is an example. Say, there are two paths: one is an onion-shaped path and the other is a circular path....

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Help with solving an equation
Hi @Amy Topaz Make a direct substitution of vgs into the equation. upCOX = 125; vtp = -0.15; lambda = -0.01; l = 1; we = 1...

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How to get a close loop transfer function from an open loop one?
Hi @Maaz Madha Assuming that the sensor measures perfectly (), then this is one of the ways: s = tf('s'); G = (13.11*s^3 + 30...

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State Space observer Result
Hi @Hamidou Youness Thanks for adding more info. However, if you are looking for assistance, it is preferred that you share you...

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Solve the system of homogeneous differential equations x1 (t) = 2x1 (t) — 2x2 (t) + x3(t) x2(t)= —x1(t) + 3x2(t) — x3(t) , x3(t) = —2x1(t) — 4x2(t) + 3x3(t) with initial con
Hi @Sandipan Jena Since you didn't copy equations properly (special formatted characters cannot be copied/pasted directly), I...

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my program is not working properly
Hi @shiv gaur It appears that the system is highly unstable and all states blow up at around 0.35 sec except for . Please check...

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Tool to optimize the exact poles for poles replacement method to get a specific state curve of the MIMO system
Hi @WijdanMTAk Maani Takrouri Have you tried tuning the gains (or poles) manually? Doing so may allow you to narrow down the ra...

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How can I solve this: (x-2)*(x+1)^3?
Hi @LUCA GIROTTI It's good to hear that you tried working out something by yourself. You need to create a symbolic variable for...

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how do I write expression for this equation??
Hi @manar zuhair I understand the frustration of a beginner. However, since you didn't provide much info, I can only guess and ...

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I need help in MATLAB code for general tan function with taylor series
Hi @Haseeb Hashim If we are looking at the same source, then you should be able to view this: https://en.wikipedia.org/wiki/...

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how to plot v-t graph for v=v0(e^-kt)?
Hi @현규 강 The method posted by @Davide Masiello is proper. Alternatively, if you want a quick plot to view, then you can do this...

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How do I code this to my transfer function ?
Hi @Jay To represent time delays in linear systems, you can write something like G = tf(1,[1 10],'InputDelay', 4) or G = tf(...

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Can MATLAB solve a Lyapunov equation symbolically?
Hi @Matt Woolf Let's try a new one by reducing the non-dependant variables. I have simplified the computation by letting , , , ...

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Can MATLAB solve a Lyapunov equation symbolically?
Hi @Matt Woolf Try this script: syms k Q pe D B Ur Up Sr Sp p11 p12 p13 p22 p23 p33 A = sym('A', [3 3]); % state matrix P ...

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Use symbolic variable for lyapunov function
Hi @Kashish Pilyal If you are writing for a journal paper or a thesis, the following explanation might be helpful. Let , , and...

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Finding a propriate function to fit "U" curve
Hi @Shilin Shi I'm not an expert in High Voltage Engineering. Please clarify if the following rational logarithmic function des...

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SDOF spring mass damper system with a nonlinear spring
Hi @jithin mathew You've got the error message simply because the system is unstable. In other words, the nonlinearity causes ...

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Is a good way to get the corresponding Gaussian MF for a triangular MF changing the type in the designer and allowing MATLAB to make the Gaussian MF?
Hi @Atonbara Diete-Koki When you change the membership function in the Fuzzy Logic Designer app, say triMF to gaussMF, the app ...

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How do I solve forward dynamics 2nd order ODE with time-dependent parameters using ODE45?
With the new info on the desired joint angle trajectory profile , the following simulations are based on 3 approaches on the con...

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Choose Lyapunov function of a linear system
Hi @Cristina Magnetti Gisolo Although my answer comes late, I hope it provides a closure on this matter. @David Goodmanson's an...

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How do I do part 2 and 3 here?
Hi @Jonathan Wehner You have done with 2a and 2c. 2b. Since you have computed the polynomial coefficients in the p vector, the...

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What migh be producing these huge amount of Warnings in my FL control?
Hi @Tony Castillo It is good to hear that my suggestion described above works for your case.

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Algrebraic loop error in MATLAB/Simulink
Hi @Giorgos Mylonas If the problem involves the exponential function and you cannot solve it using any known elementary functio...

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Temperature Control System Model
Hi @Roniel Payoyo From Gao & Li (2012), the furnace temperature system can be approximated by a First-Order Plus Dead Time (FOP...

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