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 ...

2 years 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...

2 years ago | 0

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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)); ...

2 years ago | 0

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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...

2 years ago | 0

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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...

2 years 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 ...

2 years 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 ...

2 years ago | 0

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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...

2 years ago | 1

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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 ...

2 years 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...

2 years 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...

2 years 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),...

2 years ago | 1 answer | 0

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answer

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 ...

2 years 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, ...

2 years ago | 0

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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...

2 years ago | 1

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Answered
Issues Using Dirac Function Trying to add Impulse Force at specific time
Hi Michael, The ODE solvers aren't set up to handle Dirac impulse functions this way. As I read the code (make sure to double ...

2 years ago | 0

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Answered
Errors using ode45, state representation with time variant parameter matrices
%System Parameters a = 4.5; M = 2.5e3; I = 3.2e2; k = 5e5; c = 3.6e3; v0 = 18; g = 9.81; rho = 8e2; EI = 7e8; L = 400; %Para...

2 years ago | 0

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Answered
Obscure error in mvncdf()
Walking through the debugger for this code: %{ aaa1=[4.546541072119, -19.52465262]; aaa2=[4.548657475153, -17.361228432903]; ...

2 years ago | 0

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Answered
Extracting data from SimulationOutput from multiple simulations
signalname = 'PCC_Vabc'; PCC_V_ALL = cell2mat(arrayfun(@(out) TP_rms(get(out.logsout,signalname).Values.Data),out,'UniformOutpu...

2 years ago | 0

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Answered
Finding a definite integral
Hi Sharon, It seems like we want to compute the following integral syms x u(x) k(x) w(x) I = int((u(x)+k(x))*w(x),x,0,1,'Hold...

2 years ago | 0

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How can i tune Q and R parameters of a LQI controller?
This Answer thread may be of interest. Among other things, it shows how to use the Symmetric Root Locus (SRL) technique to desig...

2 years ago | 0

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Discrete filter bode shows wrong results
FIR filters are typically specified with coefficients in ascending powers of z^-1, but the the default for tf in the Control Sys...

2 years ago | 0

Question

Should simplify() Work Better on Symbolic Expressions Involving heavisde() with an Ineteger Argument?
I was playing around with what I thought was a simple problem but turned out to not be. Let x(n) be the input to a discrete-tim...

2 years ago | 1 answer | 0

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Why does freqz function make a phase difference?
Hi Mohammad, See code below for corrections %calcuating fourier transform of x by freqz function. A=1; x=[1 2 3 4]; The arg...

2 years ago | 0

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Integration of real variable function on arbitrary interval.
Why would you expect the result to be 3/4? Plotting the function, assuming we want the real cube root plot(-1:.01:1,nthroot(-1...

2 years ago | 0

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Answered
Create FFT filter of small FFT amplitudes and replot orginal signal
Hi Coleman, If I understand your question correctly .... Once you do this: P2 = abs(Datafft/L); P1 = P2(1:L/2+1); P1(2:end-...

2 years ago | 0

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How to convert symbolic transfer function to state space?
Hi Sam, I was hoping that the OP would show a little more effort before giving the answer. Anyway ... The code should be modi...

2 years ago | 1

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How to find the frequency and amplitude of an oscillating signal?
Hi Rohan, For this signal, the output of fft without windowing gives a very good estimate of the amplitude and frequency of the...

2 years ago | 1

Answered
Simulink add Transferfunction as binominal equation
Hi Gunnar, You can use the LTI System block and enter as the block parameter: p(1)*tf(1,[p(2) 1])^p(3) assuming that only the ...

2 years ago | 0

Answered
finding the coordinate where imaginary value is zero in nyquist plot
The doc page for nyquist shows how to use it to return the real (Re) and imaginary (Im) parts along with the frequency vector (w...

2 years ago | 0