# Paul

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Question

Why Does numel() Accept More than One Argument?

@doc:numel indicates that the function accepts only a single argument. But it can be called with more than one argument and it r...

3 days ago | 1 answer | 1

### 1

answerForce symbolic simplification to eliminate variable

Hi ludolfusexe, Try equationsToMatrix load ddddh_fun symvar(ddddh_fun) syms u % A*u = b [A,b] = equationsToMatrix(ddddh_fu...

3 days ago | 0

| accepted

Band-pass filter extraction.

Hi Claudio, Start with the original code Inertial_period = 20.215; K1_period = 24; % K1 period (hours) M2_period = 12; In...

4 days ago | 1

How to make variables assigned to SimulationInput object accessible to a PostSimFunction when using parsim

Hi Afzal, I think that the simOut from the simulation being called with sim is the argument sent into the PostSimFcn. Does the ...

5 days ago | 0

| accepted

Data type symfun (code problem)

Hi Patryk, Works o.k. here. What version of Matlab are you using? syms x f(x) = x^(3/5) * (4 - x)^(1/3); df(x) = diff(f(x));...

5 days ago | 0

UAV Toolbox - Reference Frame Definition

In reference to the example on the linked page, I assume the waypoints are specified in the waypoint trajectory reference frame....

7 days ago | 0

| accepted

Fourier Series,Spectral Analysys

Define the function over one period T0 = 1; % period f0 = 1/T0; syms t s(t) = rectangularPulse(.2,0.8,t); figure fplot(s(t...

7 days ago | 1

Read excel data in Simulink and convert it into an array

Add the line coder.extrinsic('readmatrix'); at the top of the Matlab Function after the %#codegen directive. Or, read in the ...

8 days ago | 0

Question

Why Does dcm2angle Work Like This?

Suppose I have a direction cosine matrix, brought to my attention by a colleague C = round(angle2dcm(-pi/2,-pi/2,0,'ZYX')) Ext...

8 days ago | 0 answers | 0

### 0

answerssimulink -sinx integral

Hi 승표, It's not really an offset. The Integrator block parmameter 'Initial Condition' is set to zero, which corresponds to sett...

8 days ago | 2

How can I get the energy of a wave?

Hi Li-Wun, This answer may be what's needed. If not, feel free to post back here with follow-up questions, preferably with exam...

9 days ago | 0

Obtaining a dataset from bandpass function

Hi Patrik, Is the output argument 'y' from bandpass the filtered time signal that is needed?

13 days ago | 0

Building symbolic expression with vars from vector

Hi ludolfusexe, It looks like the original code was attempting to use j as a index into an array, but symbolic variables are ne...

14 days ago | 1

| accepted

when i want to get magnitude of vector in command window told me that index exceeds matrix dimensions. although i write true code

Code works here v=[1 2 3 9 6] pp=v.^2 Rr=sum(pp) mag=sqrt(Rr) disp(mag) Check norm(v) Perhaps you have variable(s) named...

16 days ago | 0

Cross-correlation in frequency domain and xcorr2 in MATLAB

Hi Shy, Assuming that the output of the xcorr2 is the expected result, it can be obtained with the changes below img1 = imread...

16 days ago | 0

| accepted

how to solve this problem?

Hi Federico, According to the nlssest, the variable names in the input and output time tables have to macth the InputName and O...

16 days ago | 1

| accepted

Difficulty in Calculating Signal Frequency with an Offset

Hi Raphael, The first point in the FFT is always the sum of the elements of the input. When the signal includes the offset, the...

16 days ago | 0

| accepted

I am getting different values of fft for the same variable as demonstrated by a simple example below...

I think you were expecting ES be equal to the first column of EF. If desired for fftshift to work along a specific dimension of...

17 days ago | 0

Non-Negative Solution with Integrator in Simulink

Hi Rajmohan, Do the parameters Limit Output along with Upper and Lower Saturation Limit do what's needed? Integrator

20 days ago | 1

| accepted

Getting different outputs from indexing and graphically.How do I verify this indexing value?..

L=10; n=1.45; Omega=1.020663297455751e+11; GAMMAb=3.590391604102621e+08; c=2.9979e8; dt=6e-12; %time increment T=1...

21 days ago | 0

| accepted

I can't place the fft curve at the signal frequency exactly. There's been a slight deviation of the fft peak at that frequency

The code has fs = 80*fmax; but the TA vector is space by dt, so fs should be fs = 1/dt;

22 days ago | 0

Are polyshape vertices preserved reliably without floating point errors?

Hi Matt, The doc pages for intersect, union, subtract, and xor all show a second output (ShapeID) that indicates if a vertex i...

23 days ago | 1

| accepted

I can't place the fft curve at the signal frequency exactly. There's been a slight deviation of the fft peak at that frequency

fmax=1e9; %maximun frequency of the signal fs=60*fmax; ts=1/fs; %time increment T=10e-9; ...

23 days ago | 0

| accepted

I get a robust controller result using musyn that is empty; "Krob = [ ]".

Hi Peter, My compliments on the quality of and effort put into this post! Based on only a quick inspection, I have the followi...

24 days ago | 0

| accepted

Why does my Transfer function overshoots

Define the plant zeros = roots([0.075, 1, 1]); poles = roots([1, 3, 5, 0]); Gs = zpk(zeros, poles,1); As was pointed out by ...

24 days ago | 1

| accepted

different color to plot

There may be fancy way to do it with a single line (or other type of) object, but it's easy to do it with two t = 0:.01:1; y =...

25 days ago | 0

| accepted

How to fix conjugated chirp signal frequency shift in spectrogram

Conjugation in the time domain corresponds to reversal and conjugation in the frequency domain. To get a basic idea of what's g...

25 days ago | 0

How to change frequency range doubling of Complex-valued Chirp Signal Spectrogram to match the Real-Valued Chirp Spectrogram

No, it appears there's no way to change that if you want to have spectrogram make the plot. Can use ylim to alter the plot afte...

25 days ago | 0

| accepted

why is NaN not of 'NaN type' in Simulink?

It looks like the block labeled "assertion1" is a Compare To Constant block. Instead use a Relational Operator block, which sup...

25 days ago | 2

| accepted

Dynamically generate a simulink block

This doc page Dynamic Masked Subsystem is probably what you're looking for. Not sure if the number of inputs or outputs can be c...

27 days ago | 0