Answered
nufft wrong result ?
Hello Kraka, Have you tried setting up your query points to exactly include f = 0.025? Also, it wasn't clear why the plot comma...

4 years ago | 0

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Answered
How to find the eigenvectors for multiple degree of system?
Hello KG, Divide each mode shape by its first element so that the first element of each mode shape is unity. M=[3 2 1;2 2 1;1 ...

4 years ago | 1

Question

Does ArrayValued Affect the Efficiency of Integral()
Suppose I want to numerically integrate a function of a scalar that returns a vector f = @(x) [1 ; sin(1000*x)]; To integrate ...

4 years ago | 1 answer | 1

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answer

Answered
mirroring a magnitude response of a filter from -1 to 1
freqz() takes a third input that allows you to specify the frequency vector. n1= 15; %order Fs= 100; %sampling frequency fc= ...

4 years ago | 0

Answered
How to reformat the display output precision of e.g. the TF() function?
EDIT 22 Oct 2022: Updated code to fix a bug where the leading coeficient of a polynomial is -1. followed by digits after the de...

4 years ago | 1

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Answered
partial sum of a series
Hi SSBGH, To plot the function, we need a set of x-values to plot over. As you've done, define the function and the CFS coeffi...

4 years ago | 0

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Fourier coefficients of a function
Hi SSBGH If you want a closed form solution, use the symbolic toolbox to define f(x) syms x f(x) = .... Once you have that y...

4 years ago | 0

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Answered
Fast Fourier Transform function
The code in the question is plotting R vs index, but it sounds like the goal is to plot R vs frequency (Hz). So we need to comp...

4 years ago | 1

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Answered
How do I keep f as a variable in a state space model, as f is supposed to be the input variable??
Hello Arya, Assuming that f(t) is the input to the system, it is not included in the B-matrix. Rathe, the B-matrix should be: ...

4 years ago | 0

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Undefined function 'hinfnorm' for input arguments of type 'tf'.
Hi Kashish, If you don't have the Robust Control Toolbox for hinfnorm(), you can probably use sigma() from the Control Systems ...

4 years ago | 0

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Answered
Plotting Root Locus In matlab with K being a positive integar
Can use r = rlocus(sys,K) where sys is the transfer function with numerator of 1 and K is a vector of positive integers of int...

4 years ago | 0

Answered
I am getting unrealistic values using vpasolve
I had to rearrange the second and third equations to muliply through by Vcl and sqrt(f) respectively and restrict the range of t...

4 years ago | 1

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Fourier series plotting and improving
Hi Faisal Running the code: syms n t T = 2; w = 2*pi/T; % Exponential Fourier series C(n) = (1/T)*(int(4*exp(-1i*w*n*t),t,...

4 years ago | 0

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Answered
What determines the maximum frequency when taking the FFT?
Hi L'O.G. If X is the output of Matlab's fft() function, then the corresponding frequency vector is: N = numel(X); wn = (0:(N...

4 years ago | 0

Answered
I am trying to plot an input function u(t) along a time interval [0,1] but I keep getting errors when i try to plot. Can anyone help me fix the code so it can plot?
Hello Royson, Looks like some sort of control problem involving the controllability Gramian? Maybe this is what you're looking ...

4 years ago | 1

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Answered
Symbolically solving vectors simultaneously
q0 = sym('q0_',[1 3]) moment=[5*q0(1)+25 6*q0(2)+45 5*q0(3)+45] solve(moment==0,q0)

4 years ago | 0

Answered
NEED HELP with fir1
Hi Justin, Executing the top part of the code ... f1 = 100; f2 = 300; f3 = 800; fs = 5000; m = (0.3*f1)/(f2/2); M = rand...

4 years ago | 0

Answered
Why does h2syn double the number of states?
Hey Ali, Both of those functions produce a dynamic controller that has the same number of states as the plant. So the resulting...

4 years ago | 0

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Answered
Trouble finding more than one solution with solve
Here's a brute force approach that at least seems to give a reasonable result for V0 = 0. This code runs very slowly because erf...

4 years ago | 0

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Answered
Need help initializing variable x and plotting probability density function
Hi Stirling, To plot the curve mean = 1930000; standardDeviation= 64000; % note theat ^2 is changed to .^2 for elementwise o...

4 years ago | 1

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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...

4 years 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; ...

4 years 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))

4 years 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...

4 years 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...

4 years ago | 3

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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...

4 years 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...

4 years ago | 1

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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(...

4 years 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 ...

4 years 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 ...

4 years ago | 0