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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...

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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 ...

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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 ...

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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...

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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 ...

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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...

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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...

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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),...

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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 ...

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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, ...

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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...

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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 ...

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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...

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

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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...

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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...

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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...

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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...

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Pregunta

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...

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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...

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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...

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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-...

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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...

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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...

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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 ...

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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...

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Getting trouble in EKF for pendulum (not tracking perfectly)
The state prediction equation needs to be modified, see below. I didn't verify the rest of the equations. g = 9.81; ...

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string match and replace string with matching number from another matrix
From the desription, it sounds like the StimNo file contains a cell array (assuming all file names are unique) stimno = {'air.w...

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Observer gain matrix calculations give warning when replicated with Matlab
Hi NGiannis, Here's the plant model and desired pole locations Gp=tf(1, [1 0 1 0]); s1=-1+i; %Desired closed loop poles s2=-...

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Root Locus Plot Is Way Off
Hi Arpad, Let's take a look at that root locus for the uncompensated system. I asusme that the red x's indicate the desired clo...

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