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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...
6 dagar 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...
8 dagar 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...
9 dagar 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)...
11 dagar ago | 0 answers | 0
0
answersRC 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,...
13 dagar 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 ...
14 dagar 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...
15 dagar 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...
18 dagar ago | 1
| accepted
Run multiple Simulink model in parallel
Check out Run Multiple Simulations and links therefrom.
22 dagar 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...
ungefär en månad 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(...
ungefär en månad 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,...
ungefär 2 månader 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...
ungefär 2 månader 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...
ungefär 2 månader 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...
ungefär 2 månader 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
ungefär 2 månader 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...
ungefär 2 månader 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 ...
2 månader 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...
2 månader 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...
2 månader 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 månader 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...
3 månader 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) ==...
3 månader 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%...
3 månader 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...
3 månader ago | 1
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 ...
3 månader ago | 1
| accepted
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...
3 månader ago | 0
SubSystem block does not have a parameter named 'MATLABFunction'
The function code in the Matlab Function block can be modified programatically using MATLABFunctionConfiguration
3 månader ago | 0
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...
3 månader ago | 0
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...
3 månader ago | 1
