# Paul

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**Content Feed**

How to concatenate using for loop?

Preallocate an empty matrix with 231 columns and then use doc vertcat each time through the loop

9 hours ago | 0

Calculate steady state error for unit step and ramp input for Zero order hold

The by-hand calculations do not appear to be correct. A quick way to get an idea if the calculations for the step input are corr...

18 hours ago | 0

What's the Best Way to Symbolically Define the Periodic Extension of a Finite Duration Signal?

The Symbolic Math Toolbox function mod() changed behavior in 2020b so that (it appears) that such a function can now be easily d...

1 day ago | 0

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 <=...

4 days 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])

4 days 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 ...

5 days 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...

5 days 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,:)

5 days 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"...

6 days 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...

6 days 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...

6 days 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...

6 days 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 ...

7 days 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...

9 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...

9 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 /...

9 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...

10 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...

10 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],...

10 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] ...

11 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...

11 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...

11 days 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:...

12 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...

12 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...

14 days 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...

14 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...

15 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 ...

16 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...

16 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...

17 days ago | 0