Answered
why the two split-step fourier methods using fft and ifft is equivalent ?
Let's take a simplified view of the loops in code1 and code2, and renaming the variables appropriately. Also, because of the way...

4 months ago | 0

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Answered
Convert discrete sys to continuous sys using delays using linear-fractional transformation (LFT)
Hi Joan, I reviewed the link from the julia site and I think I know what they're doing. But I'm not 100% sure because it seems...

4 months ago | 1

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Answered
Matlab step() from Simulink dataset
Based on the picture of the Simulink model .... sys = linearize('SIM_lab5'); step(sys)

4 months ago | 0

Answered
Im trying to replicate a simulink design, i dont know what the blocks y and u are in the library browser.
Those both look like To Workspace blocks used for logging data to the Matlab workspace for inspection/processing/etc. after the ...

4 months ago | 0

Answered
when do I need use fftshift?
Hi Daniel, Let's plot the first function Bx = 10; A = sqrt(log(2))/(2*pi*Bx); fs = 500; %sampling frequency dt = 1/fs; %...

4 months ago | 1

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Answered
I want to find the root locus of polynomial.
Running the code m_s = 5; % Mass of the spring m_r = 68; % Mass of the rotor k_r = 5.45e5; % Spring constant of the roto...

4 months ago | 0

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Answered
how to express operators in symbolic algebra
I'm not sure how define a function of a function. But this seems to work, at least for this simple case: syms x t syms q(t) v(...

4 months ago | 0

Answered
How can I fix this problem?
The variable x is defined at the top of the code to have 4 rows. In the loop that calls fsolve, x0 is defined with four elements...

4 months ago | 0

Answered
Fourier Series for odd integers only
Hi Tashanda, I see a couple of issues with the code Though not an error, it would be clearer if you specified the variable of ...

4 months ago | 0

Answered
How can I extract the x and y values of the phase- and magnitude graph of a .fig file plotted with bodeplot() or bode()?
sys = tf(1,[1 1]); bode(sys); hf = gcf; hax = hf.Children hax(2).Children % the first child is the phase plot hax(2).Child...

4 months ago | 0

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Answered
Error using fft Invalid data type.
Hi Koray, It looks like you have a signal f(t) that is defined over the interval 0 <= t <= 1.5 as: syms t; K = 20; %35; Chan...

4 months ago | 0

Answered
I want to get the value of x using the Matlab code "Out = fzero(@(x) (A-sqrt(2*pi*H*E*x*((x/E)+(x/F)^1/G))), 1000000)", but not getting the correct answer. Could you help me?
Seems to work here just fine. Why do you think you're not getting the correct answer? A = 20627000; E = 210000000000; F = 122...

4 months ago | 0

Answered
D/A converter delay transfer function
That doesn't look like the typical D/A converter ..... But, assuming T is negative you can simulate the delay of -T/2 with a Tr...

4 months ago | 0

Answered
Cannot plot negative frequencies on Nichols with recent MATLAB versions
Hi lepolonais03. Test case shows that only positive frequencies are considered, as you've obeserved. sys = zpk(1,[2 3],4); w=...

4 months ago | 0

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Answered
how to create a look up table to use in simulink from a 2D array of doubles
Assuming your 40x2 array is stored in a workspace varaiable named data. Use the 1D Lookup Table. Set the Table Data parameter ...

4 months ago | 0

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Answered
I want to know Block Diagram for "rlocus(G)" and how they calculate the overshoot of the graph.
(1) Yes, rlocus(G) fits the architecture you have. If "I can see overshoot" means that you're clicking on a branch on the root ...

4 months ago | 0

Answered
pzmap and bode do not return zeros for all specified outputs
Hi Marcel, There isn't really a problem. If you want to get the pzmap of each individual transfer function of MIMO system, then...

4 months ago | 0

Answered
why my discretized PID controller behaves differently than my continuous (unfiltered) PID?
Hi Israel, Let's take a look at the problem analytically. Define the plant and controller s = tf('s'); P = tf(1/(s^2 + s)); ...

4 months ago | 0

Answered
Is there anyway to increase the calculation speed of this sqrt integral2 without loosing accuracy?
The iterated method works much faster as compared to auto (which I assume goes to tiled). Unclear why iterated integral2 is slow...

4 months ago | 0

Answered
How does isstable(sys) and step response plot in all toolsbox on MATLAB work?
In the Control System Toolbox, isstable returns a logical value of 1 (true) for stability of a dynamic system if: In continuo...

5 months ago | 0

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Answered
Simulink integrator block reset and integrate at single time step
Hi Jaewon, If I understand correctly, the short answer is no. The whole purpose of using the iuntegrator reset to is step the ...

5 months ago | 0

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Answered
The signal generated by the chirp function has amplitude values that are not 1 in some parts of its time-domain diagram
The sampling frequency in t2 isn't high enough to catch (or get close to) all of the peaks at the higer frequencies. Here's the ...

5 months ago | 0

Answered
constructing discrete time system
Hi Junhwi, The short answer is that the sample time, st, is too large for discretizing Cdr before forming the closed-loop syste...

5 months ago | 0

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Trying to enter a transfer function in simulink (tauD s + 1)
Hi Wouter, As you've found, that transfer function can't be implemented in Simulink in a Transfer Fcn block. Depending on the ...

5 months ago | 0

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Answered
simulink tout sample time and to workspace block
By default, the tout variable is updated at every major time step of the solver. The defaults, including the variable name and w...

5 months ago | 0

Answered
Matlab Solve and simplify functions not working
Hi Brittany, Run the code: foot_forces f21_sol One option is to use vpa to convert to a VPA number. However, the result is s...

5 months ago | 1

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Question

simplify() with dirac and All = true Doesn't Work?
Why does the second call to simpify cause an error? Is that a bug? syms x real simplify(dirac(x)) % works simplify(dirac(x),...

5 months ago | 0 answers | 0

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answers

Answered
How do I express my numerator in the transfer function block (SIMULINK) if the s variable is in the exponent?
Hi Kaitlyn, What does 10*exp(-2.6*s) represent in the time domain. Or more simply, what does exp(-2.6*s) represent in the time ...

5 months ago | 0

Answered
How do you express the root locus for k in MATLAB
"How do you express the root locus for k" Assuming the question is how to plot the locus of the closed loop poles as k varies, ...

5 months ago | 0

Answered
Spike at the start of discrete integration.
In the first Discrete Derivative block that computes the rate, try setting the parameter "Initial condition for previous weighte...

5 months ago | 1

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