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Add a dynamic amount of symbolic variables into a script
numvars = 5; % for example V = sym('V',[1 numvars])

4 years 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 ...

4 years ago | 0

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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...

4 years ago | 0

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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,:)

4 years 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"...

4 years ago | 0

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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...

4 years ago | 0

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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...

4 years 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...

4 years 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 ...

4 years ago | 0

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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...

4 years ago | 1

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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...

4 years ago | 0

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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 /...

4 years 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 years 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...

4 years ago | 0

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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 years 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] ...

4 years 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...

4 years 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...

4 years 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:...

4 years ago | 0

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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...

4 years 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...

4 years ago | 1 answer | 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...

4 years ago | 0

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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...

4 years 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 ...

4 years 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...

4 years ago | 0

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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...

4 years ago | 0

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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...

4 years 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))

4 years 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...

4 years ago | 1

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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...

4 years ago | 1