Paul

Last seen: Today | Active since 2011

Statistics

All

Content Feed

Answered
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

Answered
Using Bus in Simulink
Does Load Data using the From Workspace Block include an example that will help?

ungefär 19 timmar ago | 0

Answered
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

Answered
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

| accepted

Answered
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

Answered
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

Answered
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

Answered
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

Answered
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

| accepted

Answered
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

Answered
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

Answered
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

| accepted

Answered
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

Answered
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

answer

Answered
why 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

Answered
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

| accepted

Answered
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

Answered
Transfer function matrix of a Multiple input DC-DC converter
Does linearize work on Simulink Simscape models?

12 dagar ago | 0

Answered
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

Answered
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

Answered
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

Answered
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

Answered
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

Answered
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

Answered
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

| accepted

Answered
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

Answered
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

Answered
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

Answered
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