# Paul

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**Content Feed**

Function 'odeToVectorField' introduces undesired 'free' variable

By default, the Symbolic Toolbos assumes all variables are complex. So using the ' operator, which is the complex transpose oper...

ungefär 22 timmar ago | 2

| accepted

Within a script, can I close or redirect a Windows File Explorer window opened with 'winopen'?

Maybe using an actxserver is a viable approach. I've used it for interacting with Power Point. It's not so bad once you get the...

en dag ago | 0

How can I remove this error?

Either: a) double click on the Audio Device Writer block and uncheck the box for Inherit Sample Rate from Input and set the des...

en dag ago | 0

I'm not sure if a user defined MATLAB function is executing or not in Simulink.

Consider replacing the threshold crossing detection functionality in spike_checker with a self resetting integrator. Feed the s...

en dag ago | 0

Different results when compearing DFT from fft to the "real" fourier transformation

Hi Lillebror, Referring only to the code in the original question, it looks like there is a mix up between the variables used t...

en dag ago | 1

What frustrates you about MATLAB? #2

It would be nice if I could open a file in the editor as read-only, click somewhere to set the editor for read only after a file...

3 dagar ago | 0

Most effective way to solve nonhomogeneous linear ODE problem

Hello Michal, Following up on this comment, I'd be concerned about the solution of the "reference" method if that's what's bein...

3 dagar ago | 1

Discrete Transfer Function Truncating Signal?

If the sample time of the DTF block is 0.3, and the simulation runs for 20.1 - 20.39999999 seconds, there should be 20.1/0.3 = 6...

10 dagar ago | 0

Simplify Transfer Function Matrix from State Space Form

Hi Diego, It looks like the code used the Symbolic Math Toolbox? If so, there's no need to go that route unless you really nee...

14 dagar ago | 0

| accepted

nufft wrong result ?

Hello Kraka, Have you tried setting up your query points to exactly include f = 0.025? Also, it wasn't clear why the plot comma...

14 dagar ago | 0

| accepted

How to find the eigenvectors for multiple degree of system?

Hello KG, Divide each mode shape by its first element so that the first element of each mode shape is unity. M=[3 2 1;2 2 1;1 ...

14 dagar ago | 1

Question

Does ArrayValued Affect the Efficiency of Integral()

Suppose I want to numerically integrate a function of a scalar that returns a vector f = @(x) [1 ; sin(1000*x)]; To integrate ...

15 dagar ago | 1 answer | 1

### 1

answermirroring a magnitude response of a filter from -1 to 1

freqz() takes a third input that allows you to specify the frequency vector. n1= 15; %order Fs= 100; %sampling frequency fc= ...

15 dagar ago | 0

How to reformat the display output precision of e.g. the TF() function?

The function poly2str in the CST may be of interest, I think that the numerical formatting is governed by a single line, so I g...

15 dagar ago | 0

| accepted

partial sum of a series

Hi SSBGH, To plot the function, we need a set of x-values to plot over. As you've done, define the function and the CFS coeffi...

16 dagar ago | 0

Fourier coefficients of a function

Hi SSBGH If you want a closed form solution, use the symbolic toolbox to define f(x) syms x f(x) = .... Once you have that y...

16 dagar ago | 0

| accepted

Fast Fourier Transform function

The code in the question is plotting R vs index, but it sounds like the goal is to plot R vs frequency (Hz). So we need to comp...

17 dagar ago | 1

| accepted

How do I keep f as a variable in a state space model, as f is supposed to be the input variable??

Hello Arya, Assuming that f(t) is the input to the system, it is not included in the B-matrix. Rathe, the B-matrix should be: ...

18 dagar ago | 0

Undefined function 'hinfnorm' for input arguments of type 'tf'.

Hi Kashish, If you don't have the Robust Control Toolbox for hinfnorm(), you can probably use sigma() from the Control Systems ...

18 dagar ago | 0

| accepted

Plotting Root Locus In matlab with K being a positive integar

Can use r = rlocus(sys,K) where sys is the transfer function with numerator of 1 and K is a vector of positive integers of int...

19 dagar ago | 0

I am getting unrealistic values using vpasolve

I had to rearrange the second and third equations to muliply through by Vcl and sqrt(f) respectively and restrict the range of t...

19 dagar ago | 1

Fourier series plotting and improving

Hi Faisal Running the code: syms n t T = 2; w = 2*pi/T; % Exponential Fourier series C(n) = (1/T)*(int(4*exp(-1i*w*n*t),t,...

20 dagar ago | 0

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What determines the maximum frequency when taking the FFT?

Hi L'O.G. If X is the output of Matlab's fft() function, then the corresponding frequency vector is: N = numel(X); wn = (0:(N...

20 dagar ago | 0

I am trying to plot an input function u(t) along a time interval [0,1] but I keep getting errors when i try to plot. Can anyone help me fix the code so it can plot?

Hello Royson, Looks like some sort of control problem involving the controllability Gramian? Maybe this is what you're looking ...

21 dagar ago | 1

| accepted

Symbolically solving vectors simultaneously

q0 = sym('q0_',[1 3]) moment=[5*q0(1)+25 6*q0(2)+45 5*q0(3)+45] solve(moment==0,q0)

22 dagar ago | 0

NEED HELP with fir1

Hi Justin, Executing the top part of the code ... f1 = 100; f2 = 300; f3 = 800; fs = 5000; m = (0.3*f1)/(f2/2); M = rand...

23 dagar ago | 0

Why does h2syn double the number of states?

Hey Ali, Both of those functions produce a dynamic controller that has the same number of states as the plant. So the resulting...

24 dagar ago | 0

| accepted

Trouble finding more than one solution with solve

Here's a brute force approach that at least seems to give a reasonable result for V0 = 0. This code runs very slowly because erf...

24 dagar ago | 0

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Need help initializing variable x and plotting probability density function

Hi Stirling, To plot the curve mean = 1930000; standardDeviation= 64000; % note theat ^2 is changed to .^2 for elementwise o...

25 dagar ago | 1

how can I plot a bode plot of transfer function that has one variable that changes the frequency response?

Tunable Models might be worth a look. They basically let a single model be defined with a one or more parameters that have defau...

26 dagar ago | 1