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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,...

10ヶ月前 | 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...

10ヶ月前 | 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 ...

10ヶ月前 | 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...

11ヶ月前 | 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...

11ヶ月前 | 1

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

11ヶ月前 | 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...

11ヶ月前 | 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...

11ヶ月前 | 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(...

11ヶ月前 | 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,...

12ヶ月前 | 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...

12ヶ月前 | 0

質問

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...

12ヶ月前 | 1 件の回答 | 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...

12ヶ月前 | 0

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質問

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

12ヶ月前 | 1 件の回答 | 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...

12ヶ月前 | 1

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質問

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 ...

12ヶ月前 | 1 件の回答 | 0

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質問

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...

約1年前 | 1 件の回答 | 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...

約1年前 | 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...

約1年前 | 0

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Making random to work like randi
I wonder why makedist doesn't support Uniform Distribution (Discrete). But random can be called with that distribution. N_clus...

約1年前 | 1

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Use case for eval that double/subs does not satisfy
Hi Stephen, Check out matlabFunction syms x1(t) x2(t) k12 k21 k20 k01 conds = [x1(0) == k01; x2(0) == 0]; eqn1 = diff(x1) ==...

約1年前 | 3

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Unexpected Perturbation of Constant Inputs During Full-System Linearization
Hi Gabriele, I wasn't able to create a simple model to replicate the problem, so I can't say for sure that what follows is 100%...

約1年前 | 0

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How to avoid redefining optimoptions in Simulink for real-time nonlinear optimization with fmincon (SQP)?
Are you really using a Matlab Function block? If so have you tried: function y = fcn(u) persistent options if isempty(opti...

約1年前 | 1

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How to correct numerical errors when using a chain of integrators in simulink
The initial conditions on the integrators need to be set to appropriate values to yield the expected result. Define the yellow ...

約1年前 | 1

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How can I get the correct answer for int(1/x) with symbolic integration?
Seems like the OP might be missing a sign(x), though I'm not really sure how to intrepret this result. syms x real d = diff(lo...

約1年前 | 0

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SubSystem block does not have a parameter named 'MATLABFunction'
The function code in the Matlab Function block can be modified programatically using MATLABFunctionConfiguration

約1年前 | 0

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Question about entry-wise product of general plant and weighting function matrix using Hinfstruct for multi-objective design
Continuing the discussion from this comment .... To use hinfstruct using the entrywise multiplicaiton of T(s) and W(s), it seem...

約1年前 | 0

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Matrix multiplication bugged?
Hi Antonio, Multiplying a matrix by [1;0;0] on the right should return the first column of the matrix, which is exactly the res...

約1年前 | 1

質問

Do Symbolic simplify() and expand() of Expressions Involving nchoosek() Make Sense?
Define a simple nCk expression syms k integer e = nchoosek(2,k) Evaluate at some values. Evaluation for k<0 and k>2 returns 0...

約1年前 | 1 件の回答 | 0

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Result of symbolic definite integral is clearly wrong
Hi Dan, Add assumptions on variables, might help with simplifications. syms t real syms d integer syms k integer cutoff(t) ...

約1年前 | 1