Answered
how can I plot a bode plot of transfer function that has one variable that changes the frequency response?
Tunable Models might be worth a look. They basically let a single model be defined with a one or more parameters that have defau...

26 days ago | 1

Answered
symbolic integration needed in the present code
syms h q x f(x) f0 f1(x) f2(x) f3(x) f = f0 + f1*q + f2*q.^2 + f3*q.^3; Eq0 = diff(f,x) - diff(f0,x); Eq1 = diff(f,x) - f^2; ...

27 days ago | 0

Answered
sum of dirac delta function
syms d(x) t d(x) = dirac(x); t0 = 1:3:10; % a couple of terms for example y(x) = sum(d(x-t0))

27 days ago | 0

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Answered
Why is tan(a) not equal to sin(a)/cos(a)
It's kind of a pain, but .... syms b alpha eq1 = b == sin(alpha)/cos(alpha); eq1 = rewrite(eq1,'tan') eq1 = lhs(eq1) == simp...

28 days ago | 0

Answered
Need help finding the stability of a closed loop system and storing the values.
Assuming continuous time: Gred = tf([7.385,476.7],[1,19.39,491.5,3835,0]); Kp = 0:1:200; Kd = 0:1:10; Preallocate the matrix...

28 days ago | 2

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Answered
Solving a symbolic equation for a vector
For each value of theta, there are four solutions, two of which are the trivial zero solution. All solutions can be saved in a c...

29 days ago | 0

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Answered
Finding solution of an equation containing symbolic parameters. I want solution of one symbolic parameter in terms of another
Not sure why solve doesn't work as is. See below for one approach to a solution. syms c_1 c_2 D r_t %Parameters sig = 0.2; p...

29 days ago | 1

Answered
Which is the correct transfer function notation?
Good catch. The documentation is incorrect. Assuming that sys represents the desired system, it should be entered as sys = tf(...

29 days ago | 0

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Answered
Trying to find square of "control system"
Declare the control gains and frequency as real. syms P_slozka real; % kp syms I_slozka real; %T_I syms D_slozka real; %T_D ...

29 days ago | 0

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Answered
Im trying to convolute a rect function and a sinc function
Because Gz is a variable, not a function, Gz(z) is trying to use the vector z as an index into the variable Gz. But z contains ...

30 days ago | 0

Answered
design error of closed loop linear quadratic gaussian(LQG) regulator
Hi @Jun Seung Mun I think there are a few issues with the code. First, the plant should have at least one input for the control...

30 days ago | 0

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Answered
I want to replace more than 1 random words in a sentence with "___" using matrices. I can type it out long hand but want to avoid this.
Hi Cade, It would be helpful to include an example input and show what the desired output should be. As best I can tell, maybe...

1 month ago | 0

Answered
Difference between lhsnorm and normrnd
The doc page for lhsnorm is surprisingly sparse. But it does talk about the multi-variable normal distribution, in which case si...

1 month ago | 0

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Answered
How do I reverse the effect of an integral block?
Hi Janith Are you sure the encoder is a pure differentiator? Even if it is, the simulation is likely to have problems with the...

1 month ago | 0

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Answered
Can FILTFILT(B, A, X) yeild the same results as FILTFILT(SOS, G, X) assuming inputs are generated via [z,p,k] = butter(3,Wn) + [sos,g] = zp2sos(z,p,k) and [A,B] = butter(3,Wn)
Hello Chris, Here's the code I ran (unknown to me, butter() assumes a bandpass by default with a two-element frequency vector, ...

1 month ago | 1

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Answered
Why does integrating my signal attenuate it?
Hi Janith, If the input to the integrator block is u(t) = sin(w*t), the output of the integrator will be y(t) = -1/w*cos(w*t) ...

1 month ago | 2

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Answered
What is the best way to make bodemag of multiple MIMO systems distinguishable? Markers?
Hi @Bruno Dogancic Here's some code to put an 'o' marker on every 10th data point. Adapt as needed to change markers, line styl...

1 month ago | 0

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Answered
How can i force simulink to use a set of data from another simulink model ?
Try using the sim() command instead of set_param. I had trouble with the latter, but no problems with the former. This code wo...

1 month ago | 0

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Answered
Is there a function like "y = filter(b,a,x,zi) uses initial conditions zi for the filter delays" in fftfilt? If not, what's the most efficient way to implement this?
Filtering is a linear operation so the iniital condition response and the input response can be computed separately and then add...

1 month ago | 1

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Answered
How to put this transfer function into simulink
The transfer function in question syms s H(s) = -(1 - 0.5*exp(-10*s))/(40*s + 1)/(15*s + 1) Starting from a single input sign...

1 month ago | 0

Answered
How to get simplified, symbolic solutions for definite integrals
Declare x w to be real syms x w real fn1 = exp(-abs(x))*cos(w*x) int(fn1, x, [-inf inf])/sym(pi)

1 month ago | 0

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Answered
I am trying to use the rectangular pulse function, but I am not sure how to use it correctly to solve a Fourier problem.
Hi Connor, This question brings up some interesting aspects of Fourier analysis, and how transforms of the discrete-time sample...

1 month ago | 0

Answered
Matlab and Routh criterion for evaluation of K for stability
Hi @omar khasawneh, Without a value for K I think you'll need to use the Symbolic Math Toolbox. Your code adapts easily. I did ...

1 month ago | 1

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Answered
Lsim inputs inversion provide the same result
Interesting. A quick look at the code, at least for the case where an output argument is specified, shows that the function tha...

1 month ago | 1

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Answered
FFT of the average vs average of the FFT
For a matrix input, fft() works down the columns. Maybe this: rng(100); S = rand(5); fft(mean(S,1)) % mean for each column,...

1 month ago | 0

Answered
Continuous Convolution in Time Domain
Hello @Masoud Nateghi The code needs to use the full convolution sum to approximate the convolution integral. Also, because the...

1 month ago | 0

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Answered
Impulse and step response differences
Hello @Arcadius, The differential equation in the Question is ambiguously written. Your solution for the impulse response assum...

1 month ago | 1

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Answered
FFT of Gaussian filter in 1D
Hello @Donya Khaledyan The code in the question doesn't define t nor FGHE2, so the plots can't be recreated. Code below might b...

1 month ago | 1

Answered
Find indices of multiple strings within another string
It looks like using string variables with an inner loop is much faster than a cell array with cellfun, at least here on Answers ...

1 month ago | 0

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Answered
How to do Pade approximation with different order of numerator and denominator in Matlab
The Sybolic Math Toolbox has a function pade() where the order of the numerator and denominator can be specified separately. The...

1 month ago | 0

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