Answered
LQI controller is weirdly slow in response and doesn't always reach a goal on plant
Following up from this comment, we have established that the plant is modeled in disctete-time with sampling period Ts = 0.02 s....

1 year ago | 0

Answered
Identifying the Mimo system using two inputs and two outputs
Try ssest to identify the model as a state-space system. You can then convert that to transfer function if absolutely necessary....

1 year ago | 0

Answered
Issue regarding the result from symbolic computation
Hi ArxIv, Expectations might be too high for symbolic solutions of eigenvectors. Consider a simpler, but very closely related ...

1 year ago | 2

| accepted

Answered
Root Locus from equation?
In order to use rlocus, we need to get the characteristic equation in a form of 1 + u^2*N(s)/D(s) = 0. Start with the equation ...

1 year ago | 0

Answered
how to extract a list of unique words from a set of one row strings
If UpdatedDocuments is a 1D cell array of chars ... UpdatedDocuments{1} = 'one,two,three,one'; UpdatedDocuments{2} = 'one,two,...

1 year ago | 0

Answered
How to edit the "▲" marks on the Nyquist plot and change only the lines in the negative frequency range to dashed lines
"Probably the easiest way to do this would be to use the output argument form of nyquist and then make the plot from the outputs...

1 year ago | 0

Answered
Accessing workspace variables with parallel workers
It sounds like q_e2b0 is supposed to be a base workspace variable that's not really a variable that's used in the simulation, li...

1 year ago | 0

Answered
Use the symbolic toolbox of Matlab to calculate the energy of the signals x(t) and f(t). Verify theoretically. How is the energy of these two signals related?
syms x(t) assume(t,'real'); x(t) = exp(t)/2*rectangularPulse(0,2,t) + (2*t - 8)*rectangularPulse(2,4,t) Energy in real-valued...

1 year ago | 0

Answered
Total energy in Time and Frequency Dimain
Define a real-valued, finite duration signal of length N, assumed to be uniformly spaced samples collected as Fs = 2000 Hz rng(...

1 year ago | 0

Answered
energy of a signal in t and f domain
For a finite duration signal x[n] of length N, and its Discrete Fourier Transform (DFT) X[k] (as computed by fft), the energy re...

1 year ago | 0

Answered
When K=dlqr(Ad,Bd,Q,R) is used, Ad,Bd is already discretized, why not Q,R?
According to dlqr, the Q and R matrices input to the function define the discrete-time quadratic cost function sum. In that sens...

1 year ago | 0

Answered
how to convert signal to physical signal in matlab
Mabye PS-Simulink Converter and/or Simulink-PS Converter is what you're looking for.

1 year ago | 0

Answered
Coordinate Transformation in Rotational System Equations (Spacecraft Dynamics Block)
Hi Gökhan, Why do you think that the equation is written in inertial (i.e. ICRF) frame. It looks to me like that equation is th...

1 year ago | 0

Answered
solving a nonlinear equation with complex numbers
Does this solution work? syms R syms X Zo = sym(50); Z=(R*1i*X/(R+1i*X)); r=(Z-Zo)/(Z+Zo); assume(R,'positive') assume(...

1 year ago | 1

Answered
Fourier Transform of e^jkt, not giving an answer
Need to specify that K is real. Also, if only using two arguments to fourier the second argument is the transform variable, so s...

1 year ago | 0

Answered
Second argument must be a scalar or vector of unique symbolic variables.
No error if running here w/2024b, nor did I get an error running on my local machine with 2024a syms X; syms gamma; syms Y; ...

1 year ago | 0

Answered
FFT result dependent on number of interpolation points
Hi Ali, The doc page for interpft states: "interpft(x,n) interpolates the Fourier transform of the function values in X to pro...

1 year ago | 0

Answered
How to get the datatype from the signal line to excel after compiling the model?
Hi jenny, Signal names on the outputs of a block can be found via: names = get_param(block,'OutputSignalNames'); The port (in...

1 year ago | 0

Answered
Finding the sample time of a Simulink signal/line programmatically with Simulink.Block.getSampleTimes
Hi Andrew, If the block has multiple outputs, like in your case, check out ts.ComponentSampleTimes which should be an array o...

1 year ago | 0

Answered
Not getting desired signal when I multiply sine wave and pulse generator in Simulink
Hi Deepankar, If the question shows the full model, then we can see it has no continuous states. The solver will be VariableSte...

1 year ago | 0

Answered
Plotting DTFT in Matlab
L = 1000; fg = 1000; fs = 100000; T = 1/fs; tmin = 0; K = 1; n = tmin:L; t = n*T; %Base function calculation x = xdp1(K...

1 year ago | 0

Answered
Accessing struct variable data inside MATLAB function block in Simulink
Hi Jacob, The typical way to define a parameter in a Matlab Function block is described at Use Data in Multiple MATLAB Function...

1 year ago | 0

| accepted

Answered
Unable to get sym(pi) to output Pi in matlab
Check your sympref sympref Make sure that FloatingPointOutput is set to False.

1 year ago | 2

Answered
Symbolic Piecewise Addition Issue
Seems to work here. How does the singz function work insofar as the output argument, func, is not defined inside the function. ...

1 year ago | 0

Answered
Given the spectrum of a signal x(t) , What is the minimum sample rate that would allow for x[n] to be recoverable?
Hi Zhen, Your question isn't really about Matlab. You might get more traction on a signal processing forum, like dsp.stackexcha...

1 year ago | 0

Answered
Explore DFT Resolution, need help with answer interpretation
Hi Zhen, The first code gives the expected result, you just need to zoom in to see it. If we look at how freq_axis is defined,...

1 year ago | 0

| accepted

Answered
Explore DFT frequency accuracy, got stuck
Hi Zhen, Consider the following, which is one case from the overall analysis. %Part 1 % MATLAB code to analyze the frequency ...

1 year ago | 0

| accepted

Answered
How do I name a variable in Simulink so that I can later use it to compute a value, such as sin(psi) or cos(phi) or tan(theta).
Hi DJ, I did not open your model so I'm not sure exactly what you're trying to do. Having said that, Simulink doesn't really c...

1 year ago | 0

Answered
Why is my hamming window and rectangular window values the same for sigma_omega when I make L = 21?
Another approach is to integrate the DTFT directly. The DTFT can be evaluted with freqz % Set window length L = 21 L = 21; % ...

1 year ago | 0

Answered
generating periodic trapezoidal waves with ramps
Approach using pulstran trap = @(t) interp1([0 1 2 3 4 5],[0 0 1 1 0 0],t,[],0); t = 0:.01:25; d = 0:5:25; plot(t,pulstran(t...

1 year ago | 0