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Paul


Last seen: Today Active since 2011

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Answered
Trying to add Butterworth filter after fft to obtain only some of the original signal.
Hi Alejandro, The input to filter should be the time domain sequence to be filtered, not its Fourier transform. So I guess tha...

13 hours ago | 0

Answered
How to simulate control loop with sustained oscillation
Hi banghyun jo, Describing function analysis relies on the Nyquist plot of the open-loop system, not the closed-loop system. If...

1 day ago | 0

Answered
Matrix versus Scalar Input Into Functions Using Symbolic Toolbox
Hi Sam, syms x A = [2 4 ; 1 5] ; % Polynomial q(x) = x^2 + 2*x + 15 ; As was noted above by @Voss and @Ayush Anand and @Ni...

3 days ago | 1

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Answered
Simulating linear model, can't understand error
Hi Valeriy, Because the B matrix has one column, the input to the system is a scalar. Hence the U input to lsim should have on...

3 days ago | 0

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Answered
Why does robstab fail for systems with more than two zeros?
Hi Suleyman, Generally speaking, it's best to avoid "transfer function algebra." Instead, use model construction and interconne...

4 days ago | 0

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Answered
How to put existing figures in one figure together?
If subplot layout is acceptable, then ... % open the fig files in two new figures f1 = openfig('fig1.fig','Invisible'); f2 = ...

5 days ago | 1

Answered
block name in matlab
That looks like a Rate Transition block

5 days ago | 0

Answered
The mathematical expressions resulting from two different symbolic computations are significantly different.
Case 2 can be much simplified. Were you expecting the simplified result to be returned? clear syms a b X Y c Z K M m l; X=sy...

5 days ago | 1

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Question


When Should Generalized eig() Solver be Used for Ordinary eig() Problems?
Consider the following matrix: z = sqrt(sym(2)); z1 = sqrt(sym(3)); Asym = [-z, -z^2/z1; z1, z] It has a repeated eigenvalue...

6 days ago | 1 answer | 0

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answer

Answered
How do I extract one point from a piecewise function?
Hi Allie, If M_xy and M_xz are sym objects, like so syms t M_xy = piecewise(t < 0, 0, t > 0, t); M_xz = piecewise(t < 0, 0, ...

7 days ago | 0

Answered
Simulink presenting a convergence error
Setting the fixed-step solver to ode8 seems to work pretty well for the problem shown in the question with a fixed step of 0.01....

9 days ago | 1

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Answered
symmetric solutions of linear matrix equations
Here's an alternative using mldivide, \ that arrives at the same result for this particular problem. Is it effectively the same ...

12 days ago | 0

Answered
Convolution with a time shifted box function
Hi Nghi, Why should the output of system remain at 1 for t > 2.5? For t > 2.5, the input is 0 and so we'd expect the output to...

12 days ago | 0

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Answered
in DOA, ifft weighting vector
Hi 종영, Based on the very limited information provided I took an educated guess. %% array parameters c = 3e8; f = 3e8; % nomi...

12 days ago | 1

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Answered
How to convert Matlab figures into subplots without having to redraw the plots again in the command window?
Use copyobj to copy the axes of interest to a new figure, then arrange with subplot figure plot(rand(3)) ax0 = gca; hnew =...

12 days ago | 0

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Answered
How to correctly apply dsp.FIRFilter
The input to fir() should be a column vector. N = 40; fs = 20 * 10 ^ 9; freq = [0, 1 * 10 ^ 9, 2 * 10 ^ 9, 3 * 10 ^ 9, 5 * 10...

13 days ago | 0

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Answered
Filter audio file with FIR filter
Check out filter or filtfilt for starters ...

13 days ago | 0

Answered
how to multiply every single element in a matrix to entire of another matrix?
Here's one option to store each result in a cell array that's the same size as x x = [100,500,900,1300,1700; 120,600,1080,...

13 days ago | 1

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Answered
Set elements in center of matrix into NaN values
Not sure what diameter means in this context. But, if it can be defined in terms of row and column indices, then maybe something...

13 days ago | 0

Answered
Dictionary with key-value pair of string ---> string array?
Hi cyclist, Do you mean mapping to the string array contained inside the cell? keySet = ["Jan";"Feb";"Mar"]; valueSet = {["Ne...

13 days ago | 1

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Answered
how to use a variable in finite field
How about something along these lines? y = @(a) gf(3,8)*a; y(1) y(2)

13 days ago | 0

Answered
Convolution using non-constant kernel?
Hi goc3, filter provides significant speedup rng(42); nr = 100000; A = rand(nr,1); B = rand(nr,1); w = 100; % window lengt...

14 days ago | 0

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Answered
Fourier Analysis - Magnitude spectrum and phase shift
Hi Stefan, %% Triangle wave Fourier approximation + Phase & Magnitude Spectra %% Setting Maximum Harmonic to be used (importan...

14 days ago | 0

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Answered
Operations and differentiation with symmatrix in MATLAB... possible bug?
Hi dominik, I'm not sure what Problem 1 is refering to. I think Problem 2 can be explained as follows: clear all n = 2; A =...

15 days ago | 0

Answered
Dynamically Make a Variable Name
Hi Summer, One option would be to use load with an output argument, which will put all of the variables the .mat file in a stru...

17 days ago | 1

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Answered
How to integrate acceleration into displacement data correctly?
The integration seems correct based on the implied initial conditions. Fs = 1000; % sampling freq. Ts = 1 / Fs; % sampling per...

17 days ago | 0

Answered
Expansion in a Fourier Series
% Problem_1 the Fourier series of the function f(x) % f(x)=0 -pi < x < 0 % f(x)=1 0 < x < pi %syms x n pi % pi=3.14; ...

17 days ago | 0

Answered
Plot Specific Points on Nichols Chart
Hi Amaan, The input to nichols has to be an a dynamic system model. So either you have to convert AbsN and AngN to such a mode...

17 days ago | 0

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Question


Answers Not Running Code?
Anyone else having trouble running code on Answers? I see it trying to run with 2024a, but get a message "Something went wrong....

19 days ago | 1 answer | 0

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answer

Answered
Calculating a Fourier series with MATLAB manually problem
I don't think anything is wrong with the code in the Question, at least based on visual inspection (though it's always best to u...

19 days ago | 0

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