# Paul

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**Content Feed**

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, ...

6 hours 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...

20 hours 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 ...

1 day ago | 0

| accepted

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...

1 day 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...

1 day 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 ...

2 days ago | 0

| accepted

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-...

3 days ago | 0

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...

3 days 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...

3 days 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.

4 days 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 ...

4 days ago | 0

| accepted

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, ...

4 days ago | 2

Transfer function matrix of a Multiple input DC-DC converter

Does linearize work on Simulink Simscape models?

5 days 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 ...

8 days 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.

8 days 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...

8 days 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...

9 days 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...

9 days 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]...

9 days 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...

9 days 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'...

10 days 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...

12 days 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...

12 days 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)) ...

15 days ago | 0

Error using append and connect

Hi Abdul, The third input to connect, which is the connection matrix, is incorrect. It should have two rows. Check the doc page...

15 days ago | 0

How to set integrator to make it reset its state to zero when the output negative and the state is negative?

Hi 耘岑, If the queue length can never be negative, how is it that the model is resulting in a negative queue length? In any cas...

16 days ago | 0

| accepted

'InitFcn' Error in Simulink

Hi Sule, If running the simulation in the base workspace using the sim command or the run button, just load the .mat file into ...

16 days ago | 0

[Simulink] 'Discrete' state-space block with stable system diverging its output while 'continuous' one doesn't.

"The outcome is that, with exactly the same [A,B,C,D] matrices, ...." The A,B,C,D matrices mean different things in the State ...

18 days ago | 0

How can I use the output value from the first simulation reactor as init value of a second reactor simulation block in Simulink?

Hi Raúl, Change the 'Initial Condition Source' in the Integrator block to 'external'. The integrator will then have another in...

19 days ago | 1

| accepted

LQI(): integrator response not as expected

Before getting to the LQI part of this, I'm curious about the approach for making an LQR regulator into a tracking system. Here...

19 days ago | 1

| accepted