# Paul

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**Content Feed**

IMU sensor fusion: imufilter command reduces number of samples

Hi Aishwarya, Because the decimation factor is 2, shoudn't it be expected that there be half as many output samples as there ar...

6 hours ago | 0

Using a persistent array in a Simulink function block

Hi richard, The typical structure would look like this: function [a11, a12, a21, a22, b1, b2] = fcn(I_in, V_out, U_in) persis...

12 hours ago | 0

| accepted

simple test for nufft not working

Hi Pieter, I don't think that expression for Y(k) is correct. We can check symbolically %% define signal t = sym([-1.0,1.0]);...

15 hours ago | 0

| accepted

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...

1 day ago | 0

Using Bus in Simulink

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

1 day 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 ...

1 day 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 days ago | 0

| accepted

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 days 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 days 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 days 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...

8 days 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 ...

9 days 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...

9 days 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...

9 days 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 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-...

10 days 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...

10 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...

11 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.

11 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 ...

11 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, ...

11 days ago | 2

Transfer function matrix of a Multiple input DC-DC converter

Does linearize work on Simulink Simscape models?

12 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 ...

15 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.

15 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...

15 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...

16 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...

16 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]...

16 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...

16 days ago | 0

| accepted

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'...

17 days ago | 1

| accepted