Community Profile # Paul

Last seen: Today Aktiv seit 2011

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Beantwortet
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...

etwa 19 Stunden vor | 0

Beantwortet
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...

etwa 19 Stunden vor | 1

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Frage

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),...

etwa 23 Stunden vor | 0 Antworten | 0

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Antworten

Beantwortet
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 ...

ein Tag vor | 0

Beantwortet
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, ...

3 Tage vor | 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...

4 Tage vor | 0

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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 ...

5 Tage vor | 0

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Beantwortet
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...

6 Tage vor | 0

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

6 Tage vor | 0

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Beantwortet
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...

6 Tage vor | 0

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Beantwortet
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...

6 Tage vor | 0

Beantwortet
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...

7 Tage vor | 0

Beantwortet
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...

7 Tage vor | 0

Frage

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...

8 Tage vor | 0 Antworten | 0

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Beantwortet
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...

10 Tage vor | 0

Beantwortet
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...

10 Tage vor | 0

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Beantwortet
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-...

10 Tage vor | 0

Beantwortet
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...

10 Tage vor | 1

Beantwortet
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...

11 Tage vor | 1

Beantwortet
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 ...

11 Tage vor | 0

Beantwortet
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...

11 Tage vor | 0

Beantwortet
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; ...

12 Tage vor | 0

Beantwortet
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...

14 Tage vor | 0

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Beantwortet
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=-...

15 Tage vor | 0

Beantwortet
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...

16 Tage vor | 0

Beantwortet
lla2eci conversion for geo sat
Hi Derrick, I think the effect we're seeing here is a slight angular offset betweent the ECI z-axis and the Earth's axis of rot...

16 Tage vor | 0

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Beantwortet
Unable to find transfer functon using model linearizer
Hi S L, Can you provide the parameters for your sinestream input signal? I couldn't get the Model Linearizer to run to complet...

16 Tage vor | 0

Beantwortet
stem a convolve signal
Because the first point in x corresponds to t = 0, so does the first point in y. t_conv has to have as many points as y. And the...

16 Tage vor | 0

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Beantwortet
Error using .* Matrix dimensions must agree.
The anonymous function fun won't work unless the input arguments x and y are compatible for elementwise-multiplication with u an...

17 Tage vor | 0

Beantwortet
unexpected discontinuity in graphic
Hi Konstantinos, Your plot, the plot I got on my local machine, and the plot generated here aren't quite the same,presumbably d...

17 Tage vor | 0