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Paul


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Answered
Show free variables in solution(s) instead of zeros
The way to parameterize the solutions returned from solve() is to use the ReturnConditions flag. Here is the code clear all; c...

7 hours ago | 0

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Answered
How to find the maximum value of constant, so that my function doesnt go over a certain value?
Based on your statement that the answer should be around 30-31, I'm guessing that you want to find the value of K such that the ...

1 day ago | 0

Answered
Matlab transpositions from formula
Maybe you really mean to put all those fractional exponents inside parentheses? For example: Tck = 4; Tck.^3/2 % or Tck.^(3...

3 days ago | 1

Answered
how to implement "2s+1" Tfcn in Simulink
Can't be done explicitly as you've found. Option 1: make the Tfcn (2*s + 1)/(c*s + 1) where c is small enough such that the out...

3 days ago | 0

Answered
When putting a variety of values in one at a time to an equation it outputs the right answer, but when I put in an array of values the answers are wrong
If you want y to be evaluated for each element of x, you need to use the "element-wise" operator ./ (note the dot) instead of /...

3 days ago | 0

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Answered
Integer eigenvalues in Matlab
Asusming that "a given (integer) matrix A" means that you know the values of the elements of A, then you can just use eig on the...

4 days ago | 0

Answered
Need help getting my delta functions to work
The problem is that nfft = 150; 0:0:nfft-1 is empty. What that line is bascially asking for is a vector of number from 0 to...

4 days ago | 0

Answered
How to plot several unit steps in a graph without doing it manually?
Are you looking for something like this? y2 = create_y_step(2) y4 = create_y_step(4) y8 = create_y_step(8) fplot([y2 y4 y8],...

4 days ago | 0

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Answered
Assigning values for a variable and solving symbolic equations numerically
You can use subs() and double(), at least for the "easy" versions of d0: syms d0 t positive h = 10; % Height of the tank [m] ...

5 days ago | 0

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Answered
Issue with simulating linear system using lsim inside a for loop
Each step in ReferenceModel has to use an intiial state that is the final state from the previous step. Using that term y0 is in...

5 days ago | 0

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Question


Why is a Question Closed?
I'm curious why this question is closed. A reason is given when a question, answer, or comment is flagged. Is that not the case...

6 days ago | 0 answers | 0

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Answered
Is there a way to programmatically get list of valid values/datatypes for Simulink block parameter?
I'm not sure that this can be done in general. But for dialog parameters that areof type 'enum', the options can be obtained by:...

6 days ago | 0

Answered
Mismatch between the frequency response of a transfer function and bode plot
Couldn't run the code becase sigma_d (and possibly other variables) were not defined. Can you clarify what this code snippet is...

6 days ago | 0

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Question


Why Do Some Figure Properties Not Seem to be Applied Properly when Copy/Paste to/from Clipboard?
I have two figures f1 and f2. f1 is created with bar() and f2 with histogram2(). For f1 I execute set(f1,'Color','none') set...

8 days ago | 0 answers | 0

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Answered
plot the probability distribution from Schrodinger Equation
scatter3() is used to plot points in 3D space. But f is really a function of three variables, so you'll need an alternative to v...

8 days ago | 0

Answered
Need help with discrete time SS controllability & phase portrait
Do you have a source for the equations you're trying to implement to solve for u? I thought that the controllability Grammian a...

10 days ago | 0

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Answered
Determine the output of the given Block diagram
Not clear how that Matlab code would mimic the by-hand solution without seeing the by-hand solution. But I really doubt that it ...

10 days ago | 0

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Answered
Complex representation of eigenvalues of a symbolic 2x2 matrix
Is the expected result obtained only when a is real? syms a A = [0, 1; -1, 2*cos(a)]; lambda = rewrite(simplify(eig(A),1...

10 days ago | 0

Answered
Wrong phase plot generated by angle()
The four-quadrant arctangent is needed to find the angle of a (non-zero) complex number: syms w real X(w) = 1/(1 + 1j*w)^2; p...

11 days ago | 0

Answered
How do I find out what type of block a Simulink block is?
Right click on the block. In the menu that pop-up menu, the identifier within the parentheses next to Block Parameters is the ty...

11 days ago | 0

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Answered
I need to find the values of K and a of system 1 that yields 15% overshoot and 𝐾𝑣=500 but I cant get pass this error. Please help
Need * for mulitpliation in the denominator: syms s K a g(s) = K/(s*(s+a))

12 days ago | 0

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Answered
How to Filter a Commanded Position to have Velocity and Acceleration Limits in Simulink
I'm not sure that it's feasible to meet all of the stated requirements, particularly "If the signal is not saturated, [it should...

13 days ago | 0

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Answered
hey. I keep getting an error for this code. If anyone could help me it would be greatly appreciated.
Should num also use poly2sym? Otherwise, gs is 1 x 2 transfer function matrix, which may be what you want, but maybe not. If y...

13 days ago | 1

Answered
ilaplace gives time limited result
Sometimse fplot() gets confused. Does regular plot() show the expected result? syms s syms t real A = 20e3; B = 10e3; C= 4...

13 days ago | 0

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Answered
Why Matlab do not respect the exponential matrix property \exp^{YXY^{-1}}=Y\exp^XY^{-1}?
The identity holds for the matrix exponential, which is implemented with expm(), not exp() (which is the element-wise exponentia...

13 days ago | 1

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Answered
Simulink - saw tooth signal minimum counter
Assuming that your signal has sharp corners .... One approach may be to: Input the signal into a Detect Increase block. The out...

14 days ago | 0

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Answered
Transform or eliminate states of mechss object
Even garden variety ss objects can't have the system matrices changed one by one sys = rss(4,2,2) % model with four states, tw...

14 days ago | 0

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Answered
Initializing parameters from an mfile function to a simulink file
If I understand your workflow correclty, it looks something like this: function simout = myfunction(inputarg) simparam1 = 5*...

14 days ago | 0

Answered
How to delay a loop in a function block?
I tried this in 2019a and it worked exactly as expected. The effect of the pause(1) is to make this (simple) simulation take 12 ...

14 days ago | 0

Question


What's the Best Way to Symbolically Define the Periodic Extension of a Finite Duration Signal?
Suppose I have a finite duration signal: syms s(t) s(t) = triangularPulse(0,1,1.5,t); fplot(s(t)) Now I want to define the p...

22 days ago | 0 answers | 0

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