Answered
Fourier analysis of an spwm signal
Hi Mosharof, Load the data load spwm_one_cycle.mat Plot the differences between time samples. We see that the data is not equ...

2 years ago | 0

Answered
transform the cell 'string' containing strings into a single string
load string.mat who string string_new = join(horzcat(string{:})) Probably not a good idea to have a variable named string, w...

2 years ago | 1

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Add zero padding to fft for accurate estimation
Hi Niusha Here is the first part of the code: Fs = 1e3; t = 0:0.001:1-0.001; x = cos(2*pi*100*t)+sin(2*pi*202.5*t); xdft = ...

2 years ago | 1

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Answered
calculate wrong or "/" work different
Hi pipor The ldivide, .\ and mldivide, \, which is what you're actually using here, for the scalar case are mathematically (tho...

2 years ago | 0

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Answered
How to get the eigenvalues of a transfer funciton matrix
Hi 宇航杨, Considering that question 1 is about the "eigenvalues of a transfer function matrix", I would say that defining what t...

2 years ago | 0

Answered
Why does frequency spectrum gets flipped in STFT compared to the one generated from FFT?
Using random data rng(100); Matrix = rand(1000,1); Compute the stft [s,f,t] = stft(Matrix,5000/3,Window=rectwin(32),OverlapL...

2 years ago | 0

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Answered
Stability margins for a cascaded system with getLoopTransfer functions
Hi Daam, To get the stability margins at 'e', I believe this is correct: Le = getLoopTransfer(CL,'e',-1); % open-loop function...

2 years ago | 1

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Answered
Fourier transform of an impulse response function
Hi Jason, syms t tau f real % SYSTEM I'd use heaviside, but piecewise works too. h = piecewise(t>=0, 0.01005*(exp(-t))*si...

2 years ago | 0

Answered
I have 4 input channels (time series) and two output channels (time series) form test. I would like to calculate transfer function using tfestimate (MIMO).
Hi Dhiren, Have you tried the 'mimo' option of tfestimate (link to doc page) ?

2 years ago | 0

Answered
Does Error Message Depend on Whether or Not Function is Executed Inside Try/Catch?
I put in a service request to Tech Support on this question. Their answer was that the error that's returned to the user does, o...

2 years ago | 1

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Answered
Saving signals for each case of parsim() simulation
Hi TeraWatt, 1) Not sure what the issue is. I created a simple model with one logged signal. Ran the following script (R2022a)...

2 years ago | 0

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Problems with the creation of a randomic signal
Hi Andrea, How are you defining the bandwdith? fs=200000; %sampling frequency B = 5000; %bandwidth rng(1); n = 1e4; % no...

2 years ago | 0

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Answered
Hello, I have problem with odeToVectorField in ODE second order system of equations.
The problem is confusion between sym expressions and symfun objects. g= 9.81; m= 0.468; Ix= 4.856e-3; Iy= 4.856e-3; Iz= 8....

2 years ago | 0

Answered
readmatrix error handling in Simulink Matlab function
Try using exist: function y = fcn(u) coder.extrinsic('exist'); fileexists = 100.0; % dummy assignment to specify fileexist...

2 years ago | 0

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Question

Does Error Message Depend on Whether or Not Function is Executed Inside Try/Catch?
This call to diff resolves to symbolic diff syms s diff(@(s) 1/(s+1),s) which diff(@(s) 1/(s+1),s) I guess the parser sees t...

2 years ago | 1 answer | 0

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answer

Answered
Signal processing question (phase response of a digital filter)
Hi Paul, Can you provide a simple concrete, example that illustrates your concern? I suspect that you're seeing the difference...

2 years ago | 0

Answered
Why doesn't the noise density of the Allan deviation plot match the noise density of imuSensor?
Hi Tsz Hey Lam, The example in the link was for angle random walk (ARW), but the example in the question is using white noise. ...

2 years ago | 0

Answered
Using the command hinfsyn(), returns the error "Error using DynamicSystem/hinfsyn Plant P must have an explicit state-space realization".
Hi BIJIT, Running the code .... L=500e-6; C=40e-6; R=0.01; Ts=50e-6; w_lc = 1/(sqrt(L*C)); w_sys = 2*pi*60; s = tf('s');...

2 years ago | 0

Answered
Plotting a spectrogram with y axis values as whole numbers and time set to seconds
Hi Felix, Return the output arguments of spectrogram and then you can make any plot you want with any units in any of the dimen...

2 years ago | 0

Answered
2D FFT interpolation - Keeping the amplitude
Hi canadarunner, The plot on the left is amplitude and the plot on the right is in dB. Changing the left plot to dB brings the ...

2 years ago | 0

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Answered
Issues with SImulink Output to a Vector.
It sounds like you've solved the immediate problem. Based on what's been stated, the "vectorized" approach is taking advantage ...

2 years ago | 0

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Answered
Fourier transform of dynamic mode coefficients for impinging jet along a line from nozzle exit to plate at a distance 0.6 times jet diameter
Hi DEBI, It will be easier for people to help if yor provide all of the information needed to run your code. You should save th...

2 years ago | 0

Answered
How to expand symbolic exponential numerator to reduce fraction
syms Y_t A_t K_t alpha L_t k_t w_t y_t Y_t = A_t*K_t^alpha*L_t^(1-alpha) lil_y = y_t == Y_t/L_t labor_eqn = L_t == solve(li...

2 years ago | 0

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Answered
Bessel filter analog to digital
Hi Maurizio, freqs returns the frequency vector, wb, in units of rad/sec. freqz, as used below, returns the frequency vector, ...

2 years ago | 1

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Conditionally executed functions in Simulink
A Triggered Subsystem may fit the bill. More generally, check Conditionally Executed Subsystems for more discussion.

2 years ago | 0

Answered
how to preferentially compute vector products rather than matrix products
"Is there any way to change this setting without bracket?" No. From the doc page for Operator Precedence: "Within each preceden...

2 years ago | 0

Answered
inverse Laplace transform in simulink
The Matlab Function block does not support any symbolic operations, as far as I know. I think the best you can do is structure t...

2 years ago | 0

Answered
Functions specgram and spectrogram - what does the spectogram' 3rd dimension mean and what unit it has?
Hi Peter, Until I read this question, I had never really thought about the outputs of spectrogram in an absolute sense. I only ...

2 years ago | 1

Answered
One of the systems I want to control includes disturbances in the input matrix. How can I convert this state space equation into a transfer function?
Combine u and d into a single input vector. Then the "B" matrix is composed of the Bbar and Ebar matrices concatenated together ...

2 years ago | 1

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Answered
Hello: i want to give a step input to my simulink function which starts at 1 second and ends at 1.1 seconds and having an amplitude of 0.1. Step block not working
Try using the Waveform Generator block with Waveform Definition parameter set to pulse with appropriate parameters. However, the...

2 years ago | 0

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