# Paul

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**Content Feed**

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...

2 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_...

3 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,[])

6 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...

6 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...

6 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...

7 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...

8 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...

12 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 ...

13 days ago | 0

Multivariable Zeros using Generalised Eigenvalue Problem

Is tzero what you're looking for?

13 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...

13 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_...

16 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 ...

17 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...

20 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...

20 days ago | 1

| accepted

How to find empirical and estimated (Weibull) probability density

fitdist might do the trick for fitting the distribution

21 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...

21 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...

21 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 ...

22 days 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...

22 days 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 ...

22 days ago | 0

Replacing elements in a vector

array1 = [1 2; 4 2; 5 5; 4 2]; vector1 = [2 1 1 4 3 4]; result = [2 1; 4 1; 3 3; 4 1] result1 = vector1(array1)

22 days ago | 0

| accepted

Creating a string with Permutation

Hi hazmah, Is this what you're looking for? Axes_name = string({'sint0.2';'sint0.5';'sint0.7'}) fold_2 = string({'BCA';'BPCA'...

24 days ago | 0

Visualising symbols inside the tranfer fcn block in Simulink

Make the Transfer Fcn block a little bit bigger by selecting it and stretching it with the mouse.

25 days ago | 0

| accepted

get specific magnitude response value given a specific frequency from a freqz graph

freqz accepts a third argument that allows the user to specify the desired angular frequencies to evaluate (it must have at leas...

25 days ago | 0

Why I get two different covariance matrix?

Hi Ali, Perhaps Prof. Ng has some additional assumptions about the data that aren't included in your question. To compute the c...

25 days ago | 1

| accepted

Is it possible to solve multiple linear systems of equations in parallel with one matrix operation?

Hi Bill, pagemldivide introduced in 2022a can do the trick. Whether or not this is really better than the loop .... Aa = [ 0.8...

25 days ago | 0

| accepted

I should convolve my signal with which function to have the signal itself?

Hi Donya, dirac is only defined in the Symbolic Math Toolbox and so should only be used for symbolic math, and only for continu...

28 days ago | 0

Error when taking the continuous time Fourier transform

Using some examle data ... A = 1:5; std_A = 11:15; syms t w real f(t) = sum(exp(-t./A))*heaviside(t) std_ft(t) = sqrt(sum((...

28 days ago | 0

| accepted