# Paul

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**Content Feed**

In kalman filter, the elements of state transition matrix using fourth-order runge-kutta integration

Hi Chong-You, It sounds like the system is linear and time invariant. In continuous time, the state dynamics are: xdot(t) = A...

ungefär 14 timmar ago | 0

Using Bus in Simulink

Does Load Data using the From Workspace Block include an example that will help?

ungefär 19 timmar ago | 0

Error using symfun/subsref (line 203) Invalid argument at position 2.

Hi Catalina, Need to subscript N in the foor loop to create a vector with 3 elements. Also, the final construction of N had an ...

ungefär 19 timmar ago | 0

Convert cell array of string arrays to a single string array

Hi Charles Use vertcat with a comma separated list as the input my_cell = cell(5,1); % Assign some values my_cell{1} = "even...

2 dagar ago | 0

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Function writing in MATLAB in symbolic format

It appears that the symfun objects have to have the same arguments (number and order) to add them syms rho(x,y,z,t) rho_m(x,y,z...

5 dagar ago | 0

How to input exponentials in transfer functions using Simulink?

In addition to using a single transfer function along with gains and transport delays as suggested by @Sam Chak, if you have the...

5 dagar ago | 0

How to use a from workspace function for a 1D lookup table

Dose input_grafiek have a constant value over the entire simulation run? If it does, don't use a From Workspace block. Instead, ...

7 dagar ago | 0

| accepted

Get Intermediate Signal of Block Diagram for Control System

Hi Ian, AFACIT, you did everything correctly as far as defining and connecting the diagram. With the PID controller defined, th...

7 dagar ago | 1

| accepted

How can i remove (or hide) the time units ("(seconds)") from the stepplot graphic in the x-axis?

If you're willing to accept 'hours' in the label instead of 'horas' then set the TimeUnit property of M numM=[1.123]; denM=[1 ...

8 dagar ago | 0

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Binärsignal transformation 100 [Hz] --> 2000 [Hz]

Hi julius, Does repelem meet the requirement. Here's a small example to repeat each element three times (instead of 20) to mak...

8 dagar ago | 0

How to test if an object is a simulink.parameter ?

Hi Alexandre Use find on dictionary section object to find the entries that meet the desired criterion. >> myDictionaryObj = S...

8 dagar ago | 1

| accepted

Error: Simulink Scope Block does not support 'Array' format for logging matrix signals

Why not use a To Workspace block? If haven't done already this doc page is a good place to start to compare all options. In ...

9 dagar ago | 0

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Simulink error: Time-Varying State Space block

Hi John, In the Constant blocks for sys_lqr.B and sys_lqr.C try clearing the block parameter "Interpret vector parameters as 1-...

9 dagar ago | 1

recreating nyquist regions using FFT

Are the "third" and "fourth" Nyquist zone the frequencies from Fs to 3*Fs/2 and from 3*Fs/2 to 2*Fs respectively? If so, third...

9 dagar ago | 0

Question

Did mldivide Implementation Change in R2022b?

When I run this code here on 2022b (actually, 2023a now, but I saw the same effect on 2022b) I get: load('mldivdivideex') form...

10 dagar ago | 1 answer | 0

### 1

answerwhy do my spectrogram values are negative and how to read them?

The power levels are in dB. Any positive number less than 1 is negative when converted to dB pow2db(0.5) See pow2db.

10 dagar ago | 0

How to use Cell array as block parameter using setBlockParameter in Simulink?

Hi David-ucr, I don't have 2022b and can't find EVModel in 2022a, so can't test. I also couldn't find it on the 2022b Simulink ...

10 dagar ago | 0

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Resample function is not working properly and damaging the signal

Hi goksu, The observed behavior is documented at resample specifcally here: "... resample assumes that the input sequence, x, ...

10 dagar ago | 2

Transfer function matrix of a Multiple input DC-DC converter

Does linearize work on Simulink Simscape models?

12 dagar ago | 0

use green therom to find counter clockwise circulation and outward flux

Isn't the answer 0? Using the approach referenced here syms x y real % vector field F = [7*x-3*y, 7*y-3*x]; % Define the ...

15 dagar ago | 0

Subsystem with similar functionality as of "Unit Delay"

Does the Delay block meet the need? It can accept an IC from an external source and is externally resettable.

15 dagar ago | 0

Magnitude of a vector with unit

Looks like simplify pulls the unit^2 out of the root u=symunit; x=[1 2 3]*(u.m); norm(x) simplify(norm(x)) vpa(ans) x=[1 2...

15 dagar ago | 1

| accepted

Extract time signal of specific frequences from a given time series signal

Hi Chenghao, I suspect the issue is related to the duration of x relative to the dynamics of the transient response of the filt...

15 dagar ago | 0

fft2 results don't match the analytical Fourier transform results

Hi Seyedalireza, The code below get closer, maybe all the way there, by addressing a few issues % Define the dimensions of the...

15 dagar ago | 1

| accepted

ODE45 error must return column vector

Try doing what the error message says and make sure that F is a column vector. Here's one option dFdt = [dCadt ; dCbdt ; dCcdt]...

16 dagar ago | 0

| accepted

Solving for Variables contained an interval

Referring to the form of y given in this comment: syms x real y = sin(x)*(2*cos(x) - 1) / ((1 + 2*cos(x)) * (1 - cos(x))) fp...

16 dagar ago | 0

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LQG issue: state estimates always perfect

Hi John, Disclaimer: I didn't actually look at your code. I think all of the the results you're seeing make sense. First, let'...

16 dagar ago | 1

| accepted

How do I use a root locus to find a value of K such that the damping ratio of dominant closed loop poles is a specified value?

Click on branch of the root locus and drag along the branch. The values in the datatip, which include the damping ratio, will co...

18 dagar ago | 0

Plotting Fourier Series Expansion

Hi Hanif, Maybe this will help. First, the problem statement says that one period spans -1 < x <= 1 (I don't think it matter i...

18 dagar ago | 1

| accepted

After taking the time derivative of a symbolic expression, how do you then differentiate that new expression with respect to another variable's time derivative?

Check out functionalDerivative syms y x(t) t y = sin(x); ydot = diff(y,t) syms Dx(t) ydot(t) = subs(ydot,diff(x,t),Dx(t)) ...

22 dagar ago | 0