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Problem using variable='z^-1' in Z transform with Z^-1 format
When specifying a tf in with Variable='z', the num and den are interpreted as being coefficients of descending powers of z num=...

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How do you get a symbolic answer for this z transform in MATLAB
With the default symbolic preferences sympref('default'); We have heaviside(0),disp(char(ans)) So the discrete-time unit ste...

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How to convert state space to transfer function.
See this answer for how to represent the state space model in the Control Systems Toolbox.

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How can I plot a correct fft of cosine wave?
The problem statement is to plot the Fourier Transform of a cosine (cos(2*pi*t)), but sampled with sample frequency of fs=12Hz. ...

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Adding 0 value place holders to string array
s= [ "0, 74, 46, 94" "7, 64, 8" "8, 50, 32, 70" "6, 43" "3, 55, 47"] c = count(s,",") s = arrayfun(@(s,c) join([s,repmat...

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Discussion

Would a General Hold/Release Functionality be a Good Feature for the Symbolic Toolbox?
The int function in the Symbolic Toolbox has a hold/release functionality wherein the expression can be held to delay evaluation...

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Problem with ctrbf() and its answer
Check the doc page ctrbf to see how A_bar etc. are arranged in terms of the uncontrollable and controllable portions.

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Open loop stability: Bode - Pole zero plot mismatch
Use the open-loop system developed by @Arkadiy Turevskiy in this comment sys=zpk([2.4*10^9*j -2.4*10^9*j], [-0.0000001 -11.5*10...

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Complex variable substitution using Symbolic Toolbox no working as expected.
% Define symbolic variables syms R81 R79 R80 C37 C67 T z fs %complex syms w s % complex % Define the frequency-domain transfe...

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How to get PD parameters
Hi Hasan, Let's take a look at the code. s = tf('s'); Gp = 2 / (0.2 * s + 1); %pump Gv = (2.2 * 10^-3) * 2; %valve Gt = 2...

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Inverse fft doesn't match analytical formulation
Let's take things one step at a time and see where they lead. If we have Continous-Time Fourier Transform (CTFT) F(w) = 1/w^2 ...

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Question

What are All of the Variables in the Workspace on Answers?
What are all of these and should they be here? whos In particular, having an empty double named 'i' is not good as that can sc...

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Question

Why is Documentation Missing When Installed Locally?
I have the documentation installed locally, but I just noticed that doc can't find the documenation for the Statistics and Machi...

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Gradient Vector for partial derivative seems backward for dfdx
Hi Kevin, It turns out that nDfy only gives the correct result because of the symmetry. xo = 0.8; yo = 0.2; h = 0.01; ...

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PID Controller Design by Pole Assignment
Hi Bahadir, I'm not sure if the code is implementing what it should, but the reason the result is coming back with Ki = bres = ...

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Step response of transfer function different in ODE45 than in 'step' and 'lsim'
Hi dikkemulle, The compensation is different between the two cases. For the ode45 implementation (ignoring v_desired for simp...

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M,C and K into state space model
mechss doesn't work? sys = mechss(M,D,K,B,F,[],[])

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multiply a matrix into every block matrix in a big matrix
Check out blockproc. Example data H = [1,2;3,4]; rng(100); A = rand(4,6); Result R = blockproc(A,[2 2],@(B) H*B.data) Che...

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Can you call Simulink models recursively?
Hi Jan, I think the Tapped Delay block is exactly what you need.

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Simulating the impulse response of a higher order filter.
Hi @saqib, You're probably running into issues with numerical accuracy because the coefficients in the system are so large. Ge...

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why am I Unable to overplot a line on a surface plot?
Can't recreate on Answers what you're seeing when using surface. However, I think you get what you're lookng for by using pcolor...

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Matlab ilaplace not working properly
ilaplace can return a closed form, symbolic expression if we give it some help, though it's a bit of a mess. Unclear why it need...

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how to find a function written as a series
Would be nice to see the actual mathematical equation to be solved. Assuming the equation and solution follows the exposition at...

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How to extract the term associated with a symbolic variable and assign to another symbolic variable?
syms R_v L_v L_ph U_s U_i w s U_sr U_si real; syms Z_v Z Y S; U_s = U_sr + 1i*U_si; U_i = 1 + 1i*0; s = s + 1i*w; Z_v = R_v...

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simplify() with dirac and All = true Doesn't Work?
Fixed in 2024b: syms x real simplify(dirac(x)) % works simplify(dirac(x),'All',true) % now works

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Question

Is Code Not Running on Answers?
Is code not running on Answers? Every time I hit the run button, the page hangs with the red square instead of the greeen triang...

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LQI controller is weirdly slow in response and doesn't always reach a goal on plant
Following up from this comment, we have established that the plant is modeled in disctete-time with sampling period Ts = 0.02 s....

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Identifying the Mimo system using two inputs and two outputs
Try ssest to identify the model as a state-space system. You can then convert that to transfer function if absolutely necessary....

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Issue regarding the result from symbolic computation
Hi ArxIv, Expectations might be too high for symbolic solutions of eigenvectors. Consider a simpler, but very closely related ...

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Root Locus from equation?
In order to use rlocus, we need to get the characteristic equation in a form of 1 + u^2*N(s)/D(s) = 0. Start with the equation ...

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