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# Paul

##### Last seen: 2 days ago
73 total contributions since 2011

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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...

2 days ago | 0

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 ...

9 days ago | 0

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...

11 days ago | 0

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....

11 days ago | 0

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...

11 days ago | 0

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]))

12 days 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...

13 days ago | 2 answers | 0

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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 ...

14 days ago | 0

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 = ...

14 days ago | 1

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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...

18 days 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)...

18 days ago | 1 answer | 0

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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...

23 days ago | 1 answer | 0

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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...

30 days ago | 0

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...

1 month ago | 0

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...

1 month ago | 0

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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...

1 month ago | 0

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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...

1 month ago | 0

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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 ...

1 month ago | 0

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)

1 month ago | 1

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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 = ...

1 month 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 ...

2 months ago | 2 answers | 1

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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...

2 months ago | 1 answer | 2

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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...

2 months ago | 1

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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...

2 months ago | 0

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 months ago | 0

eigen value of the transfer function 2x2 matrix
If you want to use the symbolic appoach, why not just create a matlab function to evaluate lambda(2) and then create the plot us...

2 months ago | 0

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Why do I get different outputs with bilinear and c2d(sysc,Ts,'Tustin') MATLAB functions?
The state space realization of a linear system is not unique. However, you can compare the results from both methods and show t...

2 months ago | 0

simulation on matlab (not on simulink)
If have the a license for the Control System Toolbox you can use the connect function to build the model you want from a block d...

3 months ago | 0

Easier way to remove a response from a response plot (bodeplot, stepplot, etc.)?
Does this do what you want: delete(h.Responses(idx))

3 months ago | 0

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