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# Paul

Last seen: Today Active since 2011

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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

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

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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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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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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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

block name in matlab
That looks like a Rate Transition block

5 days ago | 0

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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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

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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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

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

13 days ago | 0

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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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

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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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

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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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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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

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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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

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

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

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