# Kwin

### University of Technology Eindhoven

Previously finished a bachelor mechanical engineering and currently doing a master Systems and Control at the Eindhoven University of Technology.

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Question

Improve the accuracy/convergence of dlyap

I was playing a little with solving the discrete Lyapunov equation (A * X * A' - X + Q = 0) myself when I came across <https://m...

4 years ago | 0 answers | 0

### 0

answersArrow on Nyquist plot

Assuming a rational transfer function with real coefficients, then this can be done by inputting the complex conjugate of the or...

4 years ago | 0

Mean of many changing "for loop" 3D matrices

If you have your matrices all stored in one (four dimensional) matrix, for example |M(:,:,:,k)| would return the kth 3D matrix, ...

5 years ago | 0

Extracting the coefficient of a polynomials matrix

You could differentiate and evaluate |P| at |x=0|, so P0 = subs(P, x, 0); P1 = subs(diff(P), x, 0); P2 = subs(diff(P,...

5 years ago | 2

| accepted

Once I have located the peaks of a spectrum, how do I determine the uncertainty of their postion?

I think you can only determine uncertainty of something if you have multiple measurements of it (the more the better). If you on...

5 years ago | 0

Riccati solution using obsvf and dare

Are you sure you are trying to solve the right equation? Because DARE gives a solution for a LQR (linear quadratic regulator) de...

5 years ago | 0

Control strategies for low frequency disturbance rejection

Depending on whether you are dealing with input or output disturbance, then you either want to minimize the process sensitivity ...

5 years ago | 0

3d plot using matlab

As mentioned by Walter Roberson, you could use the function waterfall, however after testing a bit myself I found that it is a l...

5 years ago | 0

| accepted

How do i use LQR control in state space form?

Both 'W' and 'U' are inputs to your system, however I assume that you will not be able to influence 'U', so it can be considered...

5 years ago | 0

ODE suite for solving switched systems

One way of doing this is by adding the two solution, but multiply the one that is inactive by zero, dX = ((sw(k) == 0 && X(...

5 years ago | 0

How to sum up different values of a matrix?

You can reshape the matrix such that it MATLAB only calculates the cumsum of the appropriate values: B = cumsum(reshape(A, ...

5 years ago | 0

Legend- if plot is empty?

I ran into a similar problem when using contour plots, which can also be empty. The solution I came up with is: clear al...

6 years ago | 3