Answered
Why is Simulink Help Going to mathworks.com and Not Using my Local Help Browser?
Swithed the preference for documentation location to "Web, on mathworks.com," clcked Apply, switched back to "Installed Locally...

4 years ago | 0

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Control systems: Labelling multiple plots dynamically based on parameter ?
Here's a way to do it with a legend. s = tf('s'); Wn = 1; for zeta = 0.1:0.1:0.9 T = Wn^2/(s^2 + 2*zeta*Wn*s + Wn^2); ...

4 years ago | 1

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Solving two second order ODEs
I think there are a few mistakes in the code syms U(t) V(t) %Constants definition a = 1; w = 100; dU=diff(U,t); dV=diff(V,...

4 years ago | 1

Question

Why is Simulink Help Going to mathworks.com and Not Using my Local Help Browser?
I right click on a block in my Simulink block diagram and click on Help in the pop-up menu. Doing so opens up the doc page on ma...

4 years ago | 1 answer | 0

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Answered
Want to change Matlab current folder to be the same as Simulink
The easiest thing to do is use addpath() once to add the location of the .slx file to the search path. Alternatively, add this ...

4 years ago | 0

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Answered
why are the output simulation results of the following LTI system different by using 'lsim' command and theorical method calculations?
I suspect the problem is that lsim() is ineherently an approximation to the LTI system response. I think that lsim() generates ...

4 years ago | 0

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Answered
Feature similar to feedback command in simulink
Two separate issues. The first is that, as you've discovered, it's (almost?) always better to use the feedback() command as for...

4 years ago | 0

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Answered
How to substitute the values of two variables in an expression at the same time - Matlab
Can you define Q1sym as a symfun? % simple example syms b t Q1sym(b,t) = b + t; b1 = sym(1:5); t1 = sym([ 1/2, 11/20, 3/5, ...

4 years ago | 1

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Answered
Why does kron(D,I), with D and I both sized (nxn), not create a matrix sized (n^2 x n^2)?
Because D is not 5 x 5 x = sym('x', [1 15], 'real'); D = diag(-x(1) -x(2) -x(3) -x(4) -x(5)) size(D) Perhaps you meant D =...

4 years ago | 1

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Answered
How to equate two equations and find one of the unknown from it as a function of second unknown?
syms et etplusone R1 = 1.5; ntone = R1 + etplusone + et; %%Equation(1) nttwo = log(R1) + 2*etplusone + et^2; %%Equation(2)...

4 years ago | 0

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Answered
How to obtain orthogonal (not orthonormal) vectors from "orth" or "qr"?
I think this at least illustrates what you're trying to accomplish. It might not be (probably isn't) the best way % generate so...

4 years ago | 0

Question

Are there Any Restrictions on Latex Markup in Figure Titles?
This works fine: syms t s1(t) = exp(-abs(t)); figure; title("$"+latex(s1(t))+"$",'Interpreter','latex') But this does not ...

4 years ago | 1 answer | 0

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Question

My Experience with Live Script is Not Meeting Expectations. Does it Meet Yours?
Following up from this question ... I've only been using Live Script for a few months now, but I've been using it over three ve...

4 years ago | 0 answers | 1

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Tips on how to write a transfer function with "e" on simulink
The exp(-sT) in G1(s) represents a delay of T seconds between the input and output of G1(s) (in addition to the effect of the 0....

4 years ago | 0

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Different vector length on plotting convolution of Hanning signal with Dirac Delta signal
It's easier to make it work if the signals are defined over the same time vector. And use the full convolution. dt = 0.1; xt= ...

4 years ago | 1

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Question

Is the Result from dsolve() Justified for a heaviside() Input?
This question is a follow up to this one that I feel warrants a separate discussion. The problem is ... Solve this differential...

4 years ago | 0 answers | 0

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errors with musyn -- Plant must have at least <> inputs and <> outputs
The plant model has 4 outputs and 1 input. If you look at doc musyn you'll see that the second (nY) and third inputs (nU) are...

4 years ago | 0

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Solving an equation with integration constants and boundary conditions
syms sigma_r(r) A B p_2 r1 r2 sigma_r = A - B/r^2 % eqn = sigma_r == 0; % edit: commented out after posting original answer. N...

4 years ago | 1

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Answered
solution for symbolic equation: matlab can't find a solution for my equation
Use the ReturnConditions option to see all of the solutions syms x C Mo mom mom1 mus o l J(x) =(4*C*Mo*mom*mom1*mus*sin(o)*(C^...

4 years ago | 0

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How to express a variable (function) in terms of specific variables?
syms C_S C_CS C_BS C_C C_P C_B r1 r2 r3 k_A k_A1 k_S k_S1 k_D k_D1 Ct = C_S + C_CS + C_BS r1 = k_A*C_C*C_S - k_A1*C_CS; r2 = ...

4 years ago | 0

Answered
How to normalize state variables in ODE45 each timestep.
Some thoughts: a. If you know from the application that you don't have to worry about getting close to singularities, integrate...

4 years ago | 0

Answered
Feedin vector in feedback function for mimo systems
Try an example with a known solution. A = -diag(1:4); B = eye(4); C = eye(4); D = zeros(4); sysp = ss(A,B,C,D); sysk = ss(dia...

4 years ago | 0

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Question

How Can I Extract One Period of a Periodic Function that is Defined with Mod() ?
Suppose I have a function, for example syms t real f(t) = triangularPulse(-1,1,t) Now create its periodic extension using mod...

4 years ago | 0 answers | 0

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Output the amount of time it took to run a simulation
Execute simout = sim(…) Then look at simout.SimulationMetadata.TimingInfo

4 years ago | 1

Question

Can't Uninstall, What Should I Do?
Matlab, actually Simulink, was throwing some weird error. So I thought I'd unintall and then do a fresh install (of 2020b). Bu...

4 years ago | 1 answer | 0

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symbolic variables into double array, observability matrix
The function obsv() in the Control System Toolbox only accepts numeric input. If you want the symbolic form of the observability...

4 years ago | 0

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Removing path name from Simulink block name
I'm seeing the same thing, though I'm not sure that is correct base on the documentation. And it is certainly a limiting behavio...

4 years ago | 0

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Answered
discrete-time real exponential signal
Those points at zero show up because alpha is negative and the code is raising alpha to non-integer powers t. For those values o...

4 years ago | 0

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Answered
Converting differential equations to State-Space/Transfer Function representation
There really is no need to use the symbolic stuff (though you can if you really want, at least for part of the problem). Suppose...

4 years ago | 3

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Answered
Collect does not do the job
Here is one approach showing step-by-step. Many could be combined. Maybe there is a simpler way? syms y y0 muY(y) dt f=(y*di...

4 years ago | 0

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