# Paul

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**Content Feed**

FFT is shifting my artificial signal?

Hi Zach, a) create the X vector with spacing based on the sampling frequency, Fs b) create the wave vector with sinusoids comp...

2 days ago | 0

| accepted

Assigning certain seed value to Simulink Uniform Random Number block in programmatic way

Hi JW, That looks like a typographical error in the doc (which is odd, I've always imagined stuff like that is generated automa...

4 days ago | 0

| accepted

Number of filter taps in Gaussian filter design

Hi Jay, The doc page for gaussdesign states "The number of symbols between the start and end of the impulse (span) and the num...

4 days ago | 0

| accepted

Inconsistency between the FFT results and the analytic spectrum of a Gaussian function

Hi Sherwin, fft assumes the input sequence starts at k = 0, so we have to apply ifftshift on the input to fft. fs = 10; t = -...

9 days ago | 1

| accepted

How to plug x^2+y^2 in to euler's Method

Hi Michael, Focusing only on the error message ... this line is the source of the error f(i) = x.^(2).*(i)+y.^(2).*(i); ...

9 days ago | 0

Solving symbolic third order polynomial

Hi Axel, What is the source for the equations in red? Here is Matlab's solution: syms q(t) a0 a1 a2 a3 q0 q1 dq0 dq1 t0 t1; ...

12 days ago | 0

How to identify transfer function of a motor with IODelay?

Hi Erik, Here's what I tried: Load the data load forum.mat Run the script so I can operate on the same variables. Take note ...

12 days ago | 1

| accepted

Solving symbolically for variables that are equal to several equations

Hmm. Don't know why solve doesn't find a solution, syms xi v r a mu spec_eng1 = [xi == (v^2)/2-mu/r, xi == -mu/(2*a)] solve(s...

15 days ago | 0

I am trying to get my function to return two variables to the workspace. It is a very simple function. What am I doing wrong.

If you want both outputs returned, use ouput arguments on the call [m,n] = save_13(1,2) When you call a function without outpu...

15 days ago | 0

Simulink - output of a block as an another block parameter

Hi Wiktor, Some Simulink blocks have parameters that can be specified either internally or externally, such as the Integrator b...

16 days ago | 0

Hello, I want to use the LPC function to achieve AR pre-whitening, will the AR coefficient obtained by fftfilt filtering signal is a residual signal?

Hello Yx Y, Based only on reading the lpc example, it would seem that the call to fftfilt should be xest = fftfilt([0 -a(2:end...

17 days ago | 0

Using Fourier Series write a MATLAB function to synthesize the wave-form in problem (2-19), Assume A = 4mV. Your function should take n ( # of harmonics ) and produce a plot

Hi Evan First, check your code that defines one period of v(t). It''s probably easier to define v(t) using piecewise syms t T...

17 days ago | 0

Use of syms, piecewise & conv commands

Hi Ben, First you have to decide if you want to solve the problem for a closed form expression using symbolic tools, like syms ...

17 days ago | 0

| accepted

how to get the correct plot of function sin(N+1)*pi*x^2/sin(pi*x)^2 with different N

Hi Daniel, I think you are correct that the limit of y as x approaches any integer is (N+1)^2. However, all the compuations are...

18 days ago | 0

Repeat array onto the same row

A=[1,2,3,4] horzcat(A,A) horzcat(A,A(1:floor(numel(A)/2))) % or use ceils depending on how you want to handle the case where ...

19 days ago | 1

| accepted

How to plot FFT?

Hi Sara, The frequency vector needs to be corrected. And for this data it's helpful to subtract out the mean before taking the...

19 days ago | 0

| accepted

Fourier analysis of an spwm signal

Hi Mosharof, Load the data load spwm_one_cycle.mat Plot the differences between time samples. We see that the data is not equ...

21 days ago | 0

transform the cell 'string' containing strings into a single string

load string.mat who string string_new = join(horzcat(string{:})) Probably not a good idea to have a variable named string, w...

22 days ago | 1

Add zero padding to fft for accurate estimation

Hi Niusha Here is the first part of the code: Fs = 1e3; t = 0:0.001:1-0.001; x = cos(2*pi*100*t)+sin(2*pi*202.5*t); xdft = ...

22 days ago | 1

| accepted

calculate wrong or "/" work different

Hi pipor The ldivide, .\ and mldivide, \, which is what you're actually using here, for the scalar case are mathematically (tho...

25 days ago | 0

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How to get the eigenvalues of a transfer funciton matrix

Hi 宇航 杨, Considering that question 1 is about the "eigenvalues of a transfer function matrix", I would say that defining what t...

28 days ago | 0

Why does frequency spectrum gets flipped in STFT compared to the one generated from FFT?

Using random data rng(100); Matrix = rand(1000,1); Compute the stft [s,f,t] = stft(Matrix,5000/3,Window=rectwin(32),OverlapL...

29 days ago | 0

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Stability margins for a cascaded system with getLoopTransfer functions

Hi Daam, To get the stability margins at 'e', I believe this is correct: Le = getLoopTransfer(CL,'e',-1); % open-loop function...

29 days ago | 1

| accepted

Fourier transform of an impulse response function

Hi Jason, syms t tau f real % SYSTEM I'd use heaviside, but piecewise works too. h = piecewise(t>=0, 0.01005*(exp(-t))*si...

29 days ago | 0

I have 4 input channels (time series) and two output channels (time series) form test. I would like to calculate transfer function using tfestimate (MIMO).

Hi Dhiren, Have you tried the 'mimo' option of tfestimate (link to doc page) ?

30 days ago | 0

Does Error Message Depend on Whether or Not Function is Executed Inside Try/Catch?

I put in a service request to Tech Support on this question. Their answer was that the error that's returned to the user does, o...

1 month ago | 1

| accepted

Saving signals for each case of parsim() simulation

Hi TeraWatt, 1) Not sure what the issue is. I created a simple model with one logged signal. Ran the following script (R2022a)...

1 month ago | 0

Problems with the creation of a randomic signal

Hi Andrea, How are you defining the bandwdith? fs=200000; %sampling frequency B = 5000; %bandwidth rng(1); n = 1e4; % no...

1 month ago | 0

| accepted

Hello, I have problem with odeToVectorField in ODE second order system of equations.

The problem is confusion between sym expressions and symfun objects. g= 9.81; m= 0.468; Ix= 4.856e-3; Iy= 4.856e-3; Iz= 8....

1 month ago | 0

readmatrix error handling in Simulink Matlab function

Try using exist: function y = fcn(u) coder.extrinsic('exist'); fileexists = 100.0; % dummy assignment to specify fileexist...

1 month ago | 0

| accepted