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Feeds
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...
3 days ago | 0
| accepted
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...
5 days ago | 0
| accepted
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...
6 days ago | 0
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...
9 days ago | 1
Question
Why is Answers Now Showing "Ran in" Links?
AFAICT, the "ran in" link is just a link to the same question.
18 days ago | 1 answer | 0
1
answerQuestion
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...
1 month ago | 1 answer | 0
1
answerObtaining 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...
1 month ago | 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...
1 month ago | 0 answers | 1
0
answersQuestion
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)...
1 month ago | 1 answer | 0
1
answerRC 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,...
1 month ago | 0
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 ...
1 month ago | 0
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...
1 month ago | 0
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...
1 month ago | 1
| accepted
Run multiple Simulink model in parallel
Check out Run Multiple Simulations and links therefrom.
2 months ago | 2
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...
2 months ago | 1
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(...
2 months ago | 0
| accepted
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,...
3 months ago | 1
| accepted
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...
3 months ago | 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...
3 months ago | 1 answer | 1
1
answerAnalytic 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...
3 months ago | 0
| accepted
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
3 months ago | 1 answer | 3
1
answerNumerical 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...
3 months ago | 1
| accepted
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 ...
3 months ago | 1 answer | 0
1
answerQuestion
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...
3 months ago | 1 answer | 1
1
answerDifferent 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...
3 months ago | 0
| accepted
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...
3 months ago | 0
| accepted
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...
4 months ago | 1
| accepted
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) ==...
4 months ago | 3
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%...
4 months ago | 0
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...
4 months ago | 1
