# Paul

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**Content Feed**

Multiplying all 2D square matricies in a 3D matrix

Easier than putting that loop in a function? function mprod = matprod(T,h) % should do some input checking to verify that 1 <=...

ein Tag ago | 0

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Add a dynamic amount of symbolic variables into a script

numvars = 5; % for example V = sym('V',[1 numvars])

2 Tage ago | 1

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solve a system of equations symbolically

It looks like there are two equations with three unknowns for which there are many solutions. So solve() gives the results for ...

2 Tage ago | 0

Symbolic ODEs aren't symbolic?

I think the fundamental problem is that dsolve() can't find a solution. Then the error results because it doesn't know how to de...

3 Tage ago | 0

Generate all possible combinations summing up to a given number

n = 3; [C{1:n}] = ndgrid(0:n); C = cell2mat(cellfun(@(x)(reshape(x,[],1)),C,'UniformOutput',false)); C(sum(C,2) == n,:)

3 Tage ago | 0

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How to generate continuous time domain signal with different start and end time?

By "continuous time domain signal" do you mean signal defined symbolically (otherwise, I'm not sure what's meant by "continuous"...

3 Tage ago | 0

How to call the function based on the simulink model?

Since you're using 2020b, try changing your sim() command to: out = sim('zad3cw2_sim','SrcWorkspace','current') This should pr...

3 Tage ago | 0

Create a matrix of matrices

Would an ordinary 3D matrix do the trick? You can access the elements via normal indexing. As far as i'm aware, you'd have to wr...

3 Tage ago | 0

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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...

4 Tage 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 ...

5 Tage 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...

7 Tage 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...

7 Tage 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 /...

7 Tage 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...

7 Tage 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...

7 Tage 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],...

7 Tage 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] ...

9 Tage ago | 0

| accepted

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...

9 Tage ago | 0

| accepted

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...

9 Tage ago | 0 answers | 0

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answersIs 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:...

9 Tage 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...

9 Tage ago | 0

| accepted

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...

11 Tage ago | 0 answers | 0

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answersplot 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...

12 Tage 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...

13 Tage 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 ...

13 Tage ago | 0

| accepted

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...

13 Tage 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...

14 Tage 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...

15 Tage ago | 0

| accepted

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))

16 Tage 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...

16 Tage ago | 0

| accepted