Paul

Last seen: 3 days ago | Active since 2011

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Answered
Why does c2d changes the structure of the C matrix in the ss representation?
Hi Elia, When working with transfer functions, the only thing that's considered is the input/output relationship. The Control S...

3 days ago | 0

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Answered
Accessing variables from a Simulink model initFcn callback with parsim
Hi Guillermo, In my opinion, the documentation is very poor in explaining the interaction between workspaces, models, and model...

8 days ago | 0

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Question

Is the Ordering of the Output from combinations() Documented, Repeatable, and Sensible?
Suppose I want to evaluate a function of three variables over a grid of points in 3D space. For example, using three nested loo...

8 days ago | 2 answers | 0

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answers

Answered
I'm running signal processing simulations in Simulink. What's the proper way to set the solver step size?(I've attached my .slx file, tks!)
Hi ColdRabbit, As long as the Sample Time parameter of the ZOH block is set to the sampling period for which you want to comput...

12 days ago | 0

Answered
Different Results of allmargin() and margin()
Hi Florian, For a MIMO system, allmargin computes the margins of each loop with all other loops are closed. However, the comman...

16 days ago | 0

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Answered
Cannot plot Fourier Transform
Hi David, I just came across this old post. syms t w h = sin(4*(t-1))./(pi*(t-1)); H = fourier(h, t, w); % Define Input and...

16 days ago | 0

Question

How are Extrinsic Functions Handled When Executing Parallel Simulations with parsim() ?
Suppose a Simulink simulation that contains a Matlab Function block that calls another function declared as extrinsic with @doc:...

16 days ago | 0 answers | 0

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Answered
how to get the current model design in matlab?
Hi Atul, After a block is added to a Simulink diagram one can use bdroot(element) to get the name of the model in which the ele...

18 days ago | 0

Answered
Using interpolant surface in Simulink
I think the fundamental problem is that objects of class sfit are not eligible for code generation, and so cannot be used inside...

19 days ago | 1

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Answered
Spectral radius of 4×4 matrices
Hi Sunday, The code runs without error (after defining h) here on Answers using 2024b. You're seeing a different result in 2021...

21 days ago | 2

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Answered
Icare doesnt have the answer
Hi jowii, % Input Parameter a_11 = -0.0857343575298716; a_12 = -4.83449522782224; a_21 = 0.000139892812156308; a_22 = -0.10...

21 days ago | 0

Answered
H1 H2 Hv estimators all the same
Hi Riccardo, I'm only marginally familiar with the H1/H2 methods of estimation. Keeping that in mind ... load data.mat force ...

28 days ago | 0

Answered
Help using logic to edit table
T = table(["H";"L";"H";"L"],(1:4).','VariableNames',["Tide","Height"]) Thigh = T(T.Tide=="H",:) Tlow = T(T.Tide=="L",:) Or, i...

1 month ago | 0

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Question

Does Symbolic int() Always Return Justifiable Results When the Integrand Includes a kroneckerDelta?
Integrating the kroneckerDelta sounds a bit weird, but it it it's allowe it should be consistent. Define the Kronecker Delta an...

1 month ago | 0 answers | 0

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Answered
Inverse Fourier transform of unilateral exponential function - ifourier MATLAB
syms t f a = sym('a','positive'); Y(f) = 1/(a + pi*f*2i) The default parameters in sympref assume that the transfomr variable...

1 month ago | 0

Answered
pole placement controller gain trouble with identified receptance
Hi GIOVANNI, I don't understand what the math is trying to do or how f and g will be used, so this answer may be limited in sco...

1 month ago | 0

Answered
Issue with Laplace Transform for Exponential Functions in MATLAB
Hi FFU, Let's take a look at these one by one. syms t real f1 = 2^(-t); I've never seen a Laplace transform table that inclu...

1 month ago | 0

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Answered
Magnitude Plot Incorrect Frequency
Recheck the conversion from rad/sec to Hz in the plot command for the magnitude of the spectrum

1 month ago | 1

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Question

Why Doesn't doc Show Links to Other Uses of the Same Function?
Using 2024a with local documentation .... I just realized that when I open a doc page for a function that I no longer get the b...

1 month ago | 0 answers | 0

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Answered
Plotting Resistance vs Frequency Response
Looks like the model also need an Input Perturbation to define the input to the transfer function. Should be on the same menu as...

1 month ago | 0

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Answered
Filter cascade with raised cosine filter and half-band filter
Fs = 20e3; Fp = 15e3; rc = rcosdesign(0.35, 5, 2, 'sqrt'); Fs2 = 4*Fs; % Sample rate Fp2 = Fp; % Passband edge Fh2 = ...

1 month ago | 0

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Answered
vpasolve finds no solutions except the null solution
This code exceeds the run time limit here, and is taking forever running on my computer, so don't know what it produces. If sol...

1 month ago | 2

Answered
Subtraction of two symbolic matrices gives error "Array sizes must match" when the sizes are the same
Hi Jacob, Start of code rng(3) L=randi([1 10],3,3,4,4); N=randi([1 10],3,4); syms xvec [4,1] real syms xmat [4,4] real og...

1 month ago | 1

Answered
c2d Tustin not matching analytical method
Hi Alborz, %% Filter Specs Ts = 0.01; zeta = 1; wn_rps = 30 *2*pi; %% C2D (tustin) s = tf('s'); tf_cont = wn_rps^2 / (s...

1 month ago | 0

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Answered
Modify function_handle in Simulink matlab function
Assuming the ultimate goal is to have nonConOption as an input to the MatlabFunction block, I got this to work in the MatlabFunc...

2 months ago | 0

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Answered
How can I import variables from a Simulink Model Workspace to my MATLAB workspace?
Hi Hansi, Use get_param to create a handle the model workspace, and then loop over the variables in the model workspace and ass...

2 months ago | 0

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Answered
Inverse fourier transfer of cos function with time shift
Hi Matt, Keep in mind that you are inherently dealing with a windowed cosine, x1(t) = cos(4*pi*t)*w(t), where w(t) = 1 for 0 <=...

2 months ago | 0

Answered
Simulink Matlabfunction does not support Global Optimization toolbox
The MatlabFunction block always generates code, even in Normal mode. One option that may be workable is to implement your optim...

2 months ago | 1

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Answered
Switch Block: Can we disable Integer Round off option
Saturation block might be useful ...

2 months ago | 0

Answered
One zero is missing in the result of c2d function uses 'matche'
sysc = tf(11,[1,1,0]) sysd=c2d(sysc,.1,'matched'); zpk(sysd) Is the addtional zero in the textbook also at z = -1?

2 months ago | 0

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