# Paul

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**Content Feed**

How do I obtain the transfer function of this model? Simulink Linearization

Hi Jacob, The Simulink linearization is coming up with the correct answer as far as I can tell: r3=0.0254; %R3 (meters) r2=0....

13 hours ago | 0

| accepted

How can I compute structured singular value with repeated full complex blocks as allowable structured uncertainty

I think the model can be refactored so that instead of having three, Ny x 3*Ny full block uncertainties you have 3*Ny^2 diagonal...

2 days ago | 0

Frequency input to Transform Function

Hi Nerma, Check freqresp. The second argument should be a real vector of frequencies (typically > 0). The multiplication by 1j ...

3 days ago | 0

How to solve a system of linear homogeneous equations in which the unknowns are column matrices?

Hi Celso Accroding to linsolve: "If the system does not have a solution, linsolve issues a warning and returns X with all eleme...

3 days ago | 0

Vertical line for Bode plots

Hi, Nerma, xline draws the line in the current axes, which appears to be the phase axes, which aren't visible. So we can do thi...

4 days ago | 1

| accepted

Plotting the distance between 2 time stamped sets of 100hz Navigation data (difference in Latitude & Longitude)

Hi John, As always, it's best to post some sample data and code and then explain what you think isn't working or what you'd lik...

4 days ago | 0

How to plot the movement of system roots(poles) with variations to a free system variable

Hi Sohail, Let's let a2 = 1; a1 = 1; We can still set up the problem for using root locus sys = tf(1,[a2 a1 0]); % D(s) = 0 ...

5 days ago | 0

Why does yulewalk produce an unexpected dip in the middle?

Hi Nathan, Here's the original code from the question. % Get data clc;clear;close;format compact; format short g; Fs = 48000...

5 days ago | 0

| accepted

Solving a system of equations

Hi Mitra Maybe this will extend to the larger problem. syms x1 y1 z1 x2 y2 z2 syms a [1 20] A=[x1,y1,z1,0,0,0,1].'; B=[a1,a...

5 days ago | 0

How to return function arguments as a struct?

Change the signature of the function to function out = designSpec(varargin) At the bottom of the function assign to the struct...

10 days ago | 0

| accepted

When simulating the response to a specific input signal, the input data U must be a matrix with as many rows as samples in the time vector T

Hi Federico, If sysansq_equi.B has five columns then INPUT_equi must also have five columns. Also, the number of rows of INPUT_...

11 days ago | 0

| accepted

How to concatenate elements in cell array to a vector?

Q= [23 34; 44 55; 56 71; 63 49; 71 30]; B= [12 13; 10 99]; C{1}=Q; C{2}=B; Output = reshape(vertcat(C{:}).',1,[])

13 days ago | 1

| accepted

FFT convolution and iFFT process

Hi Yassine, What does this mean: "df (can be variable),"? df should be a constant for all of FT. Is that not the case? Let's...

13 days ago | 0

Accelerance FRF with modal FRF?

The two blue curves look pretty close, perhaps just off by a scale factor (except for the dip at ~600 Hz?). Those curves are the...

14 days ago | 1

| accepted

How to plot imported data into matlab equations

One way that uses symbolic (which isn't really necessaray) syms omega mu epsilon sigma h k1 = omega .* sqrt((mu .* epsilon)/(2...

15 days ago | 0

The numerator returned from ord2 function is not directly compatible with tf2zpk function.

Hi James, I'm not sure this really is a problem; all functions are working as documented. A shorter way to get the z,p,k of the...

16 days ago | 0

| accepted

Symbolic solve with user-specified precision

Hi @Kylekk Perhaps I don't fully understand the Question, but I don't think there's a way to force the Symbolic Toolbox to find...

19 days ago | 0

Determining highest power frequency in noise signal

Hi Walter, The original code in the question subtracted the mean of the entire signal (T), not the mean of just the portion to ...

20 days ago | 0

Multivariable Zeros using Generalised Eigenvalue Problem

Is tzero what you're looking for?

21 days ago | 0

How do i delete the spaces that are in the middle of a string array?

replace seems to do the trick Single char: str=' 123 456 '; replace(str,whitespacePattern,'') Cell array of chars rep...

21 days ago | 0

diffrent plots if I add the command assume (0<=t) why ?

I suggest getting in the habit of using heaviside for problems like this syms t f_t3 = cos(12*t)*exp(-0.4*t)*heaviside(t); f_...

24 days ago | 1

44.1 kHz Sample Rate

The main question is: why is there a magnitude peak, even after the signal has been filtered? If the input to a stable, linear ...

25 days ago | 1

Introduce step signal after system response

Hi mikel, No need to use ode45 for this particular problem. The delayed step response with initial conditions can be obtained a...

27 days ago | 1

| accepted

What is the use case for ifft's trailing zero padding? Why is that the default?

Hi Kevin, I think the title question is misleading. The result of zero padding ifft is not incorrect. It does exactly what it c...

28 days ago | 1

| accepted

How to find empirical and estimated (Weibull) probability density

fitdist might do the trick for fitting the distribution

28 days ago | 0

| accepted

unexpected object of type 'RootOf'

I'm going to speculate that the denominator of Zges*rect in Aufheiz6Var is of too high of an order for the Symbolic Math Toolbox...

29 days ago | 1

| accepted

Changing delay length to solve algebraic loops

Refering to the block diagram at the top of the question .... Would it be correct to replace the IC block with a Constant block...

29 days ago | 0

| accepted

Calculate Impedance of circuit using laplace transform.

Assuming that the input voltage has a Laplace transform, you can multiply Zges with the Laplace transform of the input and take ...

1 month ago | 1

| accepted

I am trying to plot this piecewise function using for loop and if statements, yet I keep receiving error message: Array indices must be positive integers or logical values.

Hi Errol, The error message shows up because the code uses g as a subscript into C, and g takes on non-integer values. But g is...

1 month ago | 0

Using mscohere() on two Signals with different sampling frequencies each

resample might be useful to bring the sampling rates together. Lots of options involved, so probably want to experiment to make ...

1 month ago | 0