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Contribute at least one answer each month for 36 consecutive months
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Feeds
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 ...
ungefär 12 timmar ago | 0
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...
ungefär 21 timmar ago | 1 answer | 0
1
answerQuestion
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...
en dag ago | 1 answer | 0
1
answerGradient 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; ...
en dag ago | 1
| accepted
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 = ...
en dag ago | 0
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...
2 dagar ago | 1
| accepted
M,C and K into state space model
mechss doesn't work? sys = mechss(M,D,K,B,F,[],[])
6 dagar ago | 0
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...
7 dagar ago | 0
Can you call Simulink models recursively?
Hi Jan, I think the Tapped Delay block is exactly what you need.
7 dagar ago | 0
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...
9 dagar ago | 0
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...
9 dagar ago | 0
| accepted
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...
9 dagar ago | 1
| accepted
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...
9 dagar ago | 0
| accepted
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...
11 dagar ago | 0
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...
14 dagar ago | 0 answers | 0
0
answersLQI 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....
16 dagar ago | 0
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....
17 dagar ago | 0
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 ...
18 dagar ago | 2
| accepted
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 ...
19 dagar ago | 0
how to extract a list of unique words from a set of one row strings
If UpdatedDocuments is a 1D cell array of chars ... UpdatedDocuments{1} = 'one,two,three,one'; UpdatedDocuments{2} = 'one,two,...
20 dagar ago | 0
How to edit the "▲" marks on the Nyquist plot and change only the lines in the negative frequency range to dashed lines
"Probably the easiest way to do this would be to use the output argument form of nyquist and then make the plot from the outputs...
21 dagar ago | 0
Accessing workspace variables with parallel workers
It sounds like q_e2b0 is supposed to be a base workspace variable that's not really a variable that's used in the simulation, li...
22 dagar ago | 0
Use the symbolic toolbox of Matlab to calculate the energy of the signals x(t) and f(t). Verify theoretically. How is the energy of these two signals related?
syms x(t) assume(t,'real'); x(t) = exp(t)/2*rectangularPulse(0,2,t) + (2*t - 8)*rectangularPulse(2,4,t) Energy in real-valued...
23 dagar ago | 0
Total energy in Time and Frequency Dimain
Define a real-valued, finite duration signal of length N, assumed to be uniformly spaced samples collected as Fs = 2000 Hz rng(...
23 dagar ago | 0
energy of a signal in t and f domain
For a finite duration signal x[n] of length N, and its Discrete Fourier Transform (DFT) X[k] (as computed by fft), the energy re...
24 dagar ago | 0
When K=dlqr(Ad,Bd,Q,R) is used, Ad,Bd is already discretized, why not Q,R?
According to dlqr, the Q and R matrices input to the function define the discrete-time quadratic cost function sum. In that sens...
24 dagar ago | 0
how to convert signal to physical signal in matlab
Mabye PS-Simulink Converter and/or Simulink-PS Converter is what you're looking for.
24 dagar ago | 0
Coordinate Transformation in Rotational System Equations (Spacecraft Dynamics Block)
Hi Gökhan, Why do you think that the equation is written in inertial (i.e. ICRF) frame. It looks to me like that equation is th...
25 dagar ago | 0
solving a nonlinear equation with complex numbers
Does this solution work? syms R syms X Zo = sym(50); Z=(R*1i*X/(R+1i*X)); r=(Z-Zo)/(Z+Zo); assume(R,'positive') assume(...
26 dagar ago | 1
Fourier Transform of e^jkt, not giving an answer
Need to specify that K is real. Also, if only using two arguments to fourier the second argument is the transform variable, so s...
27 dagar ago | 0
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