Answered
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 ...

3 years ago | 0

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Answered
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 years ago | 1

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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 years 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 years ago | 1 answer | 0

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Answered
why 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.

3 years ago | 0

Answered
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 ...

3 years ago | 0

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Answered
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, ...

3 years ago | 2

Answered
Transfer function matrix of a Multiple input DC-DC converter
Does linearize work on Simulink Simscape models?

3 years ago | 0

Answered
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 ...

3 years ago | 0

Answered
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.

3 years ago | 0

Answered
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...

3 years ago | 1

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Answered
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...

3 years ago | 0

Answered
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...

3 years ago | 1

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Answered
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]...

3 years ago | 0

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Answered
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...

3 years ago | 0

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Answered
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'...

3 years ago | 1

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Answered
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...

3 years ago | 0

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Answered
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...

3 years ago | 1

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Answered
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)) ...

3 years ago | 0

Answered
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...

3 years ago | 0

Answered
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...

3 years ago | 0

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Answered
'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 ...

3 years ago | 0

Answered
[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 ...

3 years ago | 0

Answered
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...

3 years ago | 1

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Answered
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...

3 years ago | 2

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Answered
Error getting characteristics from Linear Analysis Tool and PID Controller
Hi Vasiliy, Change the analysis point at the output of the plant from 'Open-Loop Output' to 'Output Measurement'

3 years ago | 1

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Answered
Assumption Ignored Symbolic PDF
I'm not aware of a way to put an assumption like that on an integral. In this problem, it seems like the actual form of f(z) do...

3 years ago | 0

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Answered
Convolution between two PDFs using product of Laplace transforms in Symbolic Toolbox
E(x) and F(x) are not valid pdfs. syms x real E(x) = 2.*(1 - 0.01)*dirac(x) + rectangularPulse(0, 300, x).*0.01./300 F(x) = ...

3 years ago | 0

Question

Why Can't int Find a Simple Integral?
syms x real E(x) = 99/50*dirac(x) + rectangularPulse(0, 300, x)/30000 int on first term yields expected result int(99/50*dira...

3 years ago | 2 answers | 0

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answers

Answered
How does simulink use data stored in matlab as an array for each time iteration?
Hi M.I, 141 rows does not correspond to 15 sec with 0.1 step size. Perhaps it's just 14 seconds. Whether or not you need to us...

3 years ago | 0

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