# Paul

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**Feeds**

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...

ongeveer 12 uur 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...

1 dag ago | 1

| accepted

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...

1 dag ago | 0

| accepted

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...

3 dagen ago | 0

| accepted

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 = ...

4 dagen ago | 1

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...

4 dagen ago | 1

| accepted

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...

5 dagen ago | 1 answer | 0

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answerHow 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, ...

5 dagen ago | 0

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....

8 dagen ago | 1

| accepted

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 ...

11 dagen 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...

11 dagen ago | 0

| accepted

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...

11 dagen ago | 1

| accepted

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 =...

11 dagen ago | 0

| accepted

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...

11 dagen ago | 0

| accepted

Filter audio file with FIR filter

Check out filter or filtfilt for starters ...

11 dagen 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,...

11 dagen ago | 1

| accepted

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...

12 dagen 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...

12 dagen ago | 1

| accepted

how to use a variable in finite field

How about something along these lines? y = @(a) gf(3,8)*a; y(1) y(2)

12 dagen 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...

12 dagen ago | 0

| accepted

Fourier Analysis - Magnitude spectrum and phase shift

Hi Stefan, %% Triangle wave Fourier approximation + Phase & Magnitude Spectra %% Setting Maximum Harmonic to be used (importan...

13 dagen ago | 0

| accepted

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 =...

14 dagen 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...

16 dagen ago | 1

| accepted

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...

16 dagen 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; ...

16 dagen 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...

16 dagen ago | 0

| accepted

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....

18 dagen ago | 1 answer | 0

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answerCalculating 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...

18 dagen ago | 0

| accepted

Fourier Series Curve Fitting and giving its coefficient with respect to eqaution

Hi OLuxanna, The code is attempting to implement the complex exponential Fourier series using the C_n coefficients. Let's look...

20 dagen ago | 0