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Paul


Last seen: Today Active since 2011

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Answered
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

Answered
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

Answered
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

Answered
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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Answered
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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Answered
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

Answered
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

Answered
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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Answered
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

Answered
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

Answered
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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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...

6 days 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 ...

7 days 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...

9 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...

9 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 /...

9 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...

10 days ago | 0

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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

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],...

10 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] ...

11 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...

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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answers

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:...

12 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...

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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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...

14 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...

15 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 ...

16 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...

16 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...

17 days ago | 0

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