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simulate free fall project, ode45, using reynolds no to get drag coefficient, recursive problem
Check your intiial conditions. At t = 0, ydot = 0, which yields Re == 0, which then yields isnan(C_D) == true, and subsequently...

4 years ago | 0

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Issues with Simulink unit delay
Using a unit delay is probably not what you want, because the output of the delay is held constant until the next sample time. ...

4 years ago | 0

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s domain to complex domain?
Some functions that may be of interest: doc freqresp doc abs

4 years ago | 0

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LTI s domian to z domain tranformation
The c2d() function offers several options doc c2d

4 years ago | 0

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How can I apply step signal input to a system after 20secs of delay?
Set the InputDelay property of the system to 20. If h is the system h.InputDelay = 20; step(h,opt)

4 years ago | 0

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doublet responce of doublet input
Can you express the doublet as a sum of unit step functions, eahc of which are appropriately scaled and delayed? If so, and you...

4 years ago | 0

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Using ODE45 with 4 states on a double particle pendulum
Hi Raaed, Why use symbolic when you alredy have a closed form expressions for the differential equations? Usually, the Symbolic...

4 years ago | 0

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convert 1x1 double time series data of simout in matlab to 1441 x 1 double
You can convert the timeseries to ordinary Matlab variables time = simout.Time; data = simout.Data;

4 years ago | 1

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How can I count how many times the position of a bouncing ball on the simulator hits 0?
Drag a Triggered Subsystem into the diagram. Connect the output of the <=0 block to the trigger input of the Triggered Subsyste...

4 years ago | 0

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simulink-function block
This line (and others like it) doesn't do what you think it does: 68.832 < u <= 200 Consider: u = 203; 68.832 < u <= 200 Th...

4 years ago | 0

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Answered
rearrange an equation in simulink
I'm not necessarily recommending this, but since you asked you can try an Algegbraic Constraint block.

4 years ago | 2

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Is there a block in Simulink to load equations in state variables ?
This one? State Space

4 years ago | 0

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Recurrence Relation having undefined variables
Do you get the desired result if you move the line syms lamda c0 c1 to inside the function? Also it's kind of confusing to ha...

4 years ago | 0

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Simulink block to get the specified value
One option to grab the value of a signal at a certain time and hold it afterwards is to pass it through a Triggered Subsystem, w...

4 years ago | 0

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Why do i get error while converting Block diagram to transfer function?
The problem is with this line: [a, b, c, d] = ss2tf(connect(G1,G2,G3,sum1,sum2,sum3,'r','y')) ss2tf only computes 2 outputs, b...

4 years ago | 1

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Answered
I am trying to solve 3 simultaneous ODE's. Which method to use?
This line: dy = zeros(4,1); Needs to be replaced with: dy = zeros(3,1); After that, note that the equation for dy(1) evaluat...

4 years ago | 1

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Step response error when using step
An improper transfer function has a numerator with higher order than the denominator. In your case, the numerator is second ord...

4 years ago | 1

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From numerical FFT to zero-pole diagram
Poles and zeros are based on the transfer function, which relates the output to the input. So in addition to the output signal, ...

4 years ago | 0

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how to concat two strings with data from external file inbetween?
One approach, I'm sure there are others: first = "Simpson"; last = "Wilder"; nums = string(readmatrix('input.txt')); out = ...

4 years ago | 0

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How to fit a gaussian to unnormalized data
I think you need to normalize Y by it's sum (given the unit spacing of X), not its max X = -6:1:6; Y = [1 3 1 8 5 16 18 10 6 2...

4 years ago | 1

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Answered
Knowing the closed form solution of dx/dt = 2 sin 3t − 4x, how do I construct my Simulink?
So you need to express -cos(3*t + atan(4/3)) as the sum of two sine waves. If you're allowed to make the amplitude of one of ...

4 years ago | 1

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Answered
Advices on realizing a decreasing pulsing function with Simulink.
It sounds like what you want is the input, u, to be the cumulative ON-time, and the output, m_dot, should be zero when the drivi...

4 years ago | 1

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Answered
Matrix slicing in matlab
Use mat2cell x = rand(4,2); % the matrix c = mat2cell(x,[2 2],2); % the cell array % verify c{1} - x(1:2,:) c{2} - x(3:4,:)...

4 years ago | 0

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Unable to set gain control as a variable in Simulink, setting a numeric value works OK.
It turns red with the exclamation mark because you haven't defined the variable in any workspace that the model can see (typical...

4 years ago | 0

Question

Sym Matrices can be Indexed with non-Logical/non-Integer. Bug?
Linear indexing into a sym array: A = sym([1 2;3 4]) A(.5) A(1.1) A([1.2 2.2]) But element indexing produces an error A(1...

4 years ago | 0 answers | 1

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What Happened to the SrcWorkspace Name-Value Input to the sim() Command?
Looks like one has to use a Simulink.SimulationInput object as the input to the sim() command.

4 years ago | 1

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How update some variables each time tha I'am calling simulink from Matlab funtion
Try using a Simulink.SimulationInput object. Change the code to: function [Out] = Funtion (Var1, Var2 ....) in ...

4 years ago | 1

Question

What Happened to the SrcWorkspace Name-Value Input to the sim() Command?
The SrcWorkspace Name-Value pair argument to the sim() command seems to have disappeared going from 2020b to 2021a. I searched ...

4 years ago | 2 answers | 0

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Answered
How to get generalized plant model in state space (A,B1,B2,C1,D11,D12,C2,D21,D22) using augw command?
Does this Answer help?

4 years ago | 0

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Problem when graphing digital filter chebyshev
Need some some addition arguments to freqz(). Check its doc page for more information: Fs = 44000; Fn = Fs/2; ...

4 years ago | 1