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Having trouble solving an equation
syms x eqn = sqrt(((((26892/(x)^3)+(254.7/(x^2)))/2)^2)+(6111.5/((x)^3))^2) == 19000; expand(eqn) solve is telling it can't f...

2 mois il y a | 0

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Question

Does Symbolic Math Toolbox Formally Support Function Composition?
The doc page Create Symbolic Functions states "The Symbolic Math Toolbox™ currently does not support composite symbolic function...

2 mois il y a | 1 réponse | 0

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Wrap part of a shape with a surface
Hi Robert, Perhaps something like this that draws a pathc between each height line? Salt to taste on the patch command. Is th...

2 mois il y a | 0

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Weird behavior with Three-axis Inertial Measurement Unit
"Is the purpose of the IMU to simulate a real-life IMU, or something else?" The purpose of that model is to simulate a notional...

2 mois il y a | 0

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Newtonian Mechanics vector solution needed to find the range of forces (P) that satisfy Fnetx = 0
Here is an algebraic solution; I suspect one could do the whole thing symbolically and then sub the numbers at the end. Note th...

2 mois il y a | 0

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Bode plot with right half plane zero
Hi @Anindya, The bodeplot function offers options on controlling the appearance of the plot, including to force the phase betwe...

3 mois il y a | 1

Question

Why is Answers Now Showing "Ran in" Links?
AFAICT, the "ran in" link is just a link to the same question.

3 mois il y a | 1 réponse | 0

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Question

Why Doesn't a Symbolic Matrix Equation Simplify Until After Applying subs() ?
Following code is to derive an expression for the derivative of the magnitude of a vector function of time. clearvars syms t r...

3 mois il y a | 1 réponse | 0

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Obtaining the differential equations from graphical representation of the problem
One can implement the equations of motion in Simulink and then use linearize to get the differential equation, but that requires...

3 mois il y a | 0

Question

Is Assignment from symmatrix/symfunmatrix Consistent with Assignment from sym/symfun ?
I've just started using symmatrix and symfunmatrix and noticed a behavior that I don't understand and seems to be inconsistent w...

3 mois il y a | 1 réponse | 1

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Question

How Does the 'All' Option Affect the Result of Symbolic simplify?
Start with a simple expression syms alpha beta real f = cos(beta)-cos(beta)*cos(alpha)^2 and try to simplify it: simplify(f)...

3 mois il y a | 1 réponse | 0

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RC Circuit Simulation in Simulink Shows Incorrect Charging Time
Hi Xiaolong, Disclosure: I did not actually open your model. If you know the fastest system dynamics are on the order of 1e-6,...

4 mois il y a | 0

Discussion

It is Time for the Symbolic Math Toolbox to Include dot and cross Functions
Edit 15 Oct 2025: Removed incorrect code. Replaced symmatrix2sym and symfunmatrix2symfun with sym and symfun respectively (latte...

4 mois il y a | 0

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Gibbs-like behaviour with lowpass on long signals
Hi qfn, I think that lowpass, et. al. will result in transients due the large, effective steps at the endpoints. I think this ...

4 mois il y a | 0

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What frame of reference is the CG input to the IMU in Aerospace pack?
Hi Mats, According to IMU Location the CG input is to be provided in a coordinate frame that is fixed to the body. However, the...

4 mois il y a | 0

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Indexing based on part of a string
column1 = [1;2;1;2;1]; column2 = ["2025-02 A";"A 2025-02";"B";"a 2025-02 a";"b 2025-02 b"]; T = table(column1,column2) T(T.col...

4 mois il y a | 1

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Run multiple Simulink model in parallel
Check out Run Multiple Simulations and links therefrom.

4 mois il y a | 2

Discussion

Will Disucssions Front End be Updated to be Consistent with Back End?
Apparently, the back end here is running 2025b, hovering over the Run button and the Executing In popup both show R2024a. ver m...

4 mois il y a | 0

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ilaplace doesn't handle tanh()
Hi Marcel, I attempted to recreate the example with the information provided, but got a different result. syms s syms T posit...

4 mois il y a | 1

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Control System Designer: Inconsistent Controller Output Step Response
I can recreate these result and uc/r certainly looks incorrect. After exporting the systems to the base workspace I get: >> tf(...

5 mois il y a | 0

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tf2sos input argument
Hi Nicolai, As far as I know, discrete time transfer functions in the Signal Processing Toolbox (SPT), whether b/a or sos form,...

5 mois il y a | 1

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iztrans not giving correct result?
syms z n The fact that the default value for heaviside(0) = 1/2 doesn't matter here, but should be kept in mid in general. x...

5 mois il y a | 0

Question

What Is the Behavior of Symbolic nchoosek With n < 0 ?
According to nchoosek:Algorithms "If k < 0 or n – k < 0, nchoosek(n,k) returns 0." syms n k f(n,k) = nchoosek(n,k) Using the...

5 mois il y a | 1 réponse | 1

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Analytic solution of quatric polynomial does not add up
Hi thejinn1314, simplify-ing the general solution with IgnoreAnalyticConstraints might be useful, though perhaps could cause so...

5 mois il y a | 0

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Question

Why Does Answers Run Code in 2025a But the Run Button, the "Executing In" Popup, and the "Ran In" Tag Still Show 2024b?
ver

5 mois il y a | 1 réponse | 3

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Numerical precision issues when using tf('s')
I thin the general recommendation is that zpk is superior to tf, and that ss is superior to both. See Using the Right Model Repr...

5 mois il y a | 1

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Question

How Do Assignment and Deletion Work with an Empty Index on the Left Hand Side ?
I've always thought that indexing with an empty array on the LHS of an = is a no-op for the variable on the LHS (there could be ...

5 mois il y a | 1 réponse | 0

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Question

Must a Function be in Scope Before Creating a Handle to It?
The doc page Create Function Handle states: "Keep the following in mind when creating handles to functions: Scope — The functi...

5 mois il y a | 1 réponse | 1

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Different Output using For Loop vs Elementwise operation
x = linspace(0,pi,100); y = cos(x); This probably isn't what you want. Perhaps you mean z = zeros(size(x)) or something simila...

6 mois il y a | 0

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Looking for an efficient way to run Simulink on thousands of independent files
If I'm understanding the workflow correctly, it seems like you could set up a loop to read in each mat file and set the appropri...

6 mois il y a | 0

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