Answered
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...

9 months ago | 1

Answered
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(...

10 months ago | 0

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Answered
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,...

10 months ago | 1

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Answered
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...

10 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...

10 months ago | 1 answer | 1

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Answered
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...

10 months ago | 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

10 months ago | 1 answer | 3

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Answered
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...

10 months ago | 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 ...

10 months ago | 1 answer | 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...

11 months ago | 1 answer | 1

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Answered
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...

11 months ago | 0

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Answered
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...

11 months ago | 0

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Answered
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...

11 months ago | 1

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Answered
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) ==...

11 months ago | 3

Answered
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%...

11 months ago | 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...

11 months ago | 1

Answered
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 ...

11 months ago | 1

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Answered
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...

11 months ago | 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

11 months ago | 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...

11 months ago | 0

Answered
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...

12 months ago | 1

Question

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...

12 months ago | 1 answer | 0

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Answered
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) ...

12 months ago | 1

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How to Control Simulink from Matlab during Simulation
Perhaps dashboard blocks would be helpful.

12 months ago | 0

Answered
Simulink parameters change during simulation from Matlab cmd line
To be clear, the intent is to change at the command line, while the simulation is running, base workspace variables that are blo...

12 months ago | 0

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Question

Why Can an Anonymous Function be Defined with a Non-Existent Parameter?
Define an anonymous function with one argument (x) and one parameter (y) f = @(x) x + y; I'm suprised that line sails through ...

12 months ago | 1 answer | 1

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Answered
How to write a timetable to excel with rowtimes as dates without times?
"If there was a way in Matlab to change the format in the first column in the excel file from "m/d/yy hh:mm" to "d-mmm-yyyy", my...

12 months ago | 0

Answered
Matlab sorting numbers oddly
Hi Elijah, Would be helpful if you showed the code for reading the files. If I'm understanding correctly, maybe you could use ...

12 months ago | 0

Answered
Zero-Padding Position for FFT
Hi Jason, The data in x can't span exactly -0.5*T to 0.5*T if it has an even number of uniformly spaced samples. Assuming the ...

12 months ago | 0

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Answered
How To Handled Fixed Point Datatype in Simulink if I am Not Having Fixed Point Designer Licence?
Hi Anup, If by "handle fixed Datatype" you mean that you have to work with a model that uses fixed-point functionality, check o...

1 year ago | 0