Community Profile # Paul

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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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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

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

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

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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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

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

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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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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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?

6 days ago | 0 answers | 0

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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

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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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

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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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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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

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

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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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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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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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

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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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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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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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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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

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