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Paul


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How to extract the term associated with a symbolic variable and assign to another symbolic variable?
syms R_v L_v L_ph U_s U_i w s U_sr U_si real; syms Z_v Z Y S; U_s = U_sr + 1i*U_si; U_i = 1 + 1i*0; s = s + 1i*w; Z_v = R_v...

1日 前 | 0

質問


Is Code Not Running on Answers?
Is code not running on Answers? Every time I hit the run button, the page hangs with the red square instead of the greeen triang...

4日 前 | 0 件の回答 | 0

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回答

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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....

7日 前 | 0

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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....

8日 前 | 0

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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 ...

8日 前 | 2

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回答済み
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 ...

9日 前 | 0

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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,...

11日 前 | 0

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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...

11日 前 | 0

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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...

13日 前 | 0

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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...

14日 前 | 0

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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(...

14日 前 | 0

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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...

14日 前 | 0

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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...

15日 前 | 0

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

15日 前 | 0

回答済み
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...

15日 前 | 0

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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(...

17日 前 | 1

回答済み
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...

18日 前 | 0

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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; ...

22日 前 | 0

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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...

22日 前 | 0

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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...

25日 前 | 0

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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...

25日 前 | 0

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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...

29日 前 | 0

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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...

29日 前 | 0

回答済み
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...

約1ヶ月 前 | 0

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

約1ヶ月 前 | 2

回答済み
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. ...

約1ヶ月 前 | 0

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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...

約2ヶ月 前 | 0

回答済み
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,...

約2ヶ月 前 | 0

| 採用済み

回答済み
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 ...

約2ヶ月 前 | 0

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回答済み
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...

約2ヶ月 前 | 0

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