Question

Does Matlab Take Full Advantage of the BLAS Routines?
It's my understanding that Matlab uses BLAS routines under the hood for many matrix algebra operations. Is that correct? If so,...

4 mois il y a | 1 réponse | 0

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Memoize an anonymous function with externally scoped variables
[Matt J added:] "... MATLAB® returns the associated cached output values if the following conditions are true. The input argum...

5 mois il y a | 1

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Solution of ODE with Symbolic Math Toolbox.
Use rewrite to get the solution in terms of heaviside. syms("t", "positive") syms("T_1", "k_p", "positive") syms("u(t)", "y(t...

6 mois il y a | 0

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BodePlot: Plotting straight lines on the Mag and Phase plots. Can access the phase plot, to do so, but not the mag plot
Looks like the mag and phase axes were reversed, specify the axis input to the line commands. The NextPlot commands aren't neede...

6 mois il y a | 0

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chebyshev II BPF magnitude response is not equal to 1 in the passband - incorrect magnitude response when using freqz(b,a)
Hi Mohamad, When using the two-output form of zp2sos the gain, g, must be applied to the output of freqz to get the correct fre...

6 mois il y a | 1

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How to approach iterative data reading?
Hi Eric, Use logical indexing. time = [rand(1, 5000)]; accel = [rand(1,5000)]; gcamp = [rand(1,5000)]; sd = std(accel); th...

7 mois il y a | 0

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how to use mussv with negative frequency?
mussv appears to run w/o error for a complex-valued state space model and does extend its analysis to negative frequencies. Alt...

7 mois il y a | 1

Discussion

550,000 Questions on Answers
The 550,000th question has been asked on Answers. How to build a BESS model phasor system - MATLAB Answers - MATLAB Central

7 mois il y a | 0

Question

Why Does polyval Return Zero When the Coefficients are Empty?
polyval([],1) polyval(ones(1,0),1) Do those results follow from a mathematical justification or are they arbitrarily specified...

7 mois il y a | 3 réponses | 1

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pwelch method of power spectral density (psd) calculation
As to why pwelch applies datawrap for the case nfft < numel(win) ... I did a bit more searching to try to find the motivation f...

7 mois il y a | 0

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Zero gain margin for an stable system from both allmargin and margin
I believe that allmargin yields a result that a user could incorrectly interpret for this example. Define the open-loop transfe...

7 mois il y a | 0

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Direct Dynamics of Two-Link Manipulator
It looks like the Matlab Function block is commented. Right click on it and then click Uncomment on the pop-up menu.

7 mois il y a | 0

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Trying to filter timeseries data by logical index on time within matlab function block but it tells me property Time not recognized as valid
Hi Matthew, The output signal of the From File block is not a time series, it's probably a double. The output from the Constan...

7 mois il y a | 0

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Does [V,D] = eig(A) always return normalized eigenvectors for any real matrix A?
Whether or not the columns of V are normalized to unit magnitude depends on how eig is called. See eig - Eigenvalues and eigenv...

7 mois il y a | 1

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Rate Limiter in enabled subsystem
I tried a Rate Limiter block inside an Enabled Subsystem and the simulation ran to completion in both Normal and Accelerator mod...

7 mois il y a | 1

Question

What is the Best Way to Call Matlab from a C++ Program and Return Results to that Program?
What is the best way to call Matlab from a C++ program and return results to that program? So far, I can see two options: 1. U...

7 mois il y a | 1 réponse | 0

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How to make a matlab script that runs simulink model to run parallel instances of the model
Hi alberto, The third input to setVariable should be the actual value of the variable. simIn(idx) = simIn(idx).setVariable('Se...

7 mois il y a | 0

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How to Configure Simscape Multibody Block Parameters Using MATLAB
Hi Justina, It does appear that the Simscape Multibody documentation is sparse to non-existent on programmatic use of block par...

7 mois il y a | 1

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Robust Control: dksyn example
I believe the issue here is that: the plant is unstable, the construction of P2 duplicates all of the states in the generalize...

7 mois il y a | 0

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A quarter car model with additional massless degree of freedom for the top mount
Hi @Simon Aldworth Seems like the equation for the massless element would be: m5*x5ddot = kp * (x1 - x5) + cs * (x2dot - x5dot...

8 mois il y a | 0

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How can I store data from my simulink model in and and use it during runtime.
Does the trigger event enable the execution of an enbabled subsystem? Is the data to be captured from a signal inside that enabl...

8 mois il y a | 0

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simulink reference block or library block
Hi stephane, Component-Based Modeling Guidelines - MATLAB & Simulink is a good place to start, followed by the links at the bot...

8 mois il y a | 0

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searchin for an M file in all folders of my PC.
The dir command can recursively search. I think for this question it would be d = dir("C:\**\filetofind.m")

8 mois il y a | 1

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Repeated uncertanity Blocks in robust control
Hi Amit, As far as I can see, mussv does not support repeated, full, complex blocks. Out of curiosity, in what sort of problem...

8 mois il y a | 0

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Why Does ifourier Not Return Equivalent Results for Equivalent Transforms?
Tech Support confirmed a bug (and it's quite pernicious IMO). Their suggested workaround for this particular problem is to simp...

8 mois il y a | 1

Question

Why Does ifourier Not Return Equivalent Results for Equivalent Transforms?
Consider two expressions of a Fourier transform syms t omega real HU(omega) = -(exp(-omega*1i)*(exp(omega*1i) - 1)*(omega + 1i...

8 mois il y a | 1 réponse | 0

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Any way to remove terms smaller than "digits" from symbolic expression? R2023a
"Uh, it's always the term that's on the order of the smallest number representable by digits." Giving the benefit of the doubt ...

8 mois il y a | 1

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Accessing Simulink model inputs and outputs when stepping model via MATLAB set_param(mdl, 'SimulationCommand', 'step') command
Hi Sebastian, Check out the doc page for using a simulation object. It make it easier to do what you want.

8 mois il y a | 1

Question

Why Doesn't pwelch with the 'centered' Option Follow the Same Convention as fftshift for Even nfft?
When the fft length is even, fftshift flips the input so that the Nyquist point is to the left. But pwelch with freqrange = 'cen...

8 mois il y a | 1 réponse | 0

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Question

Should Unity Value be Displayed when Multiplied by a symunit?
The following results look peculiar IMO. Shouldn't a unit always be preceded by a value? I've never seen this convention before....

8 mois il y a | 1 réponse | 0

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