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Paul


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78 total contributions since 2011

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Question


How Do I Determine which Group Variables Correspond to the Results of SplitApply
Suppose I use splitapply as follows, taken directly from its doc page: >> load patients >> whos Gender Height Name ...

environ 5 heures ago | 1 answer | 0

1

answer

Answered
Im confused by Matlab's dontinuous-to-discrete conversion methods and how they work
I'll give an initial answer and then come back and edit if you have any more questions. As far as the table goes: The Zero-ord...

2 jours ago | 0

Answered
How can I eliminate numbers with "e" in the transfer function and show them in their long form?
If you don't mind me asking, why do you want to display G10 with coefficients in their long form? If you just want to seem them...

6 jours ago | 0

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Answered
Problem with Bode Plot of cascaded discrete time systems
I can't tell you why your result is so inaccurate; I suspect it has to do with numerical issues in how the CST develops the tf f...

6 jours ago | 1

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Answered
Effects of Zero Order Hold in Simulink linearization
"My expectation is to obtain a continuous-time linear system whose frequency response is essentially equal to that of the discre...

6 jours ago | 0

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Unable to properly feedback an updated signal in simulink
Is there a reason why you wan to use a feedack loop where none really exists? Keep in mind that feedback loop is sampled and th...

9 jours ago | 0

Answered
How to solve Ax=B with some knowns in x and B
The original question that you asked is inconsistent with your comment to John's answer. The question specfies only a total of ...

16 jours ago | 0

Answered
How to plot from txt file using textscan?
I’ve been having a lot of success lately in these types of problems by using extractFileText to read it all into a string, and t...

18 jours ago | 0

Answered
Find Eigenvalues without function "eig"
roots(poly(A)) Though I’m sure one could come with an A for which this approach will fail due to numerical accuracy issues....

18 jours ago | 0

Answered
How to use matlab to calculate a gain, to a specific limit of a transfer function?
You can use evalfr(minreal(sys),f) f is the complex frequency to which you want to take the limit. The minreal is to...

19 jours ago | 0

Answered
Plotting second order ode response
f=matlabFunction(y); t=0:.001:1; plot(t,f(t)),grid If you have the Control System Toolbox: step(tf(36,[1 12 36]))

19 jours ago | 0

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Question


Should Implicit Expansion be Applied to Additional Functions?
I know that some don't like implicit expansion. Given that it's likely here to stay, should it be made applicable to some additi...

21 jours ago | 2 answers | 0

2

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Second Order Differential Equation with Constant to Transfer Function
If c2 is a constant, there is no transfer function from U to Y because that is not the differential equation for a linear, time ...

21 jours ago | 0

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what is the sampling frequency limit in 'c2d' cmd for a stable discrete system?
It appears to be a numerical issue when using c2d with you transfer function model. Try converting to state space first: sys = ...

21 jours ago | 1

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Answered
c2d function 'zoh' method formula
I suspect that in your first case for C the substitution you cite is only applicable because of the form of C. In general, the Z...

25 jours ago | 0

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Question


How Can I Save a Struct Array to a Text File?
I have a struct array. Each field in the struct arrray is a column vector, and the column vectors are of unequal lengths. s(1)...

26 jours ago | 1 answer | 0

1

answer

Question


How Can I Zoom with Multiple Axes on a Plot
I create a plot and add a secondary x-axis. The code for the secondary x-axis came from dbp in a post that for the life of me I...

environ un mois ago | 1 answer | 0

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answer

Answered
Diagonalising a Skew-Symmetric Matrix
For your matrix B, you can diagonalize it and get the associated trasnsformation matrix as follows: [T,J]=jordan(B); any(any...

environ un mois ago | 0

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Delayed step/ impulse response
Use the time invariance and lineraity properties of an LTI system. One approach is to generate the the nominal impulse or step r...

environ un mois ago | 0

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simulink/simscape final state 'cannot find a matching block state to element 135' output by the same model
Are you trying to use operatining points? If you are: Comparing your code to the examples in that link to the doc two things st...

environ un mois ago | 0

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Answered
How to obtain output data sample given the input data samples and a transfer function in Z-domain?
G=tf(2,[1 1],-1,'Variable','z^-1') G = 2 -------- 1 + z^-1 Sample time: unspecified Discrete-time transfe...

environ 2 mois ago | 0

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Answered
How to start a simulation in steady-state ?
Is this what you're looking for? https://www.mathworks.com/help/simulink/ug/saving-and-restoring-simulation-operating-point.htm...

environ 2 mois ago | 0

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Answered
Symbolic seems to have an error
The RHS of your differential equation should be 3*u. In the frequency domain, Y(s) = H(s)*U(s). It looks like you're trying to ...

environ 2 mois ago | 0

Answered
How can i plot a impulse response based on z-transfer function or difference equation
G = tf([1 2 3 0 0],[1 0 0 0 -1],-1); impulse(G,20)

environ 2 mois ago | 1

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Answered
How to solve a transfer function equation in Matlab
The function allmargin in the Control System Toolbox solves for abs(H(jw)) = 1 (among other things) >> G G = ...

environ 2 mois ago | 0

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Question


Is there a Way to Determine Which Function Will be Called Without Actually Calling the Function ?
Suppose there is a function myfunc that has many instantiations on the path because of overloading. Is there a way to determine ...

environ 2 mois ago | 2 answers | 1

2

answers

Question


Can the Font Size of an Axis Label be Reliably Determined Programatically
AFAICT, there are three ways to set the font size of an axis label and there are three ways to get the font size of an axis labl...

environ 2 mois ago | 1 answer | 2

1

answer

Answered
Magnitude and Phase response of a Lowpass filter
it sounds like there are two issues here: 1. estimating a frequency response using test inputs, 2. what does lowpass do. Let's t...

environ 2 mois ago | 1

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Answered
How Can I add input disturbance for a given specific time gap on a second order transfer function
Do either of these options do what you're looking for? s=tf('s'); wn=6; z=2/3; Gs=wn^2/(s^2+2*z*wn*s+wn^2); % define a ti...

environ 2 mois ago | 0

Answered
Analysis of the stability of the system characterized by the transfer function
Does this do what you want: >> nyquist(G) >> [P,Z]=pzmap(G);hold on;plot(real(P),imag(P),'x'),plot(real(Z),imag(Z),'o')

2 mois ago | 0

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