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Determine the Length of One Oscillation
I think this problem is supposed to be attacked like this. Define H(z) syms z H(z) = (-3*z^2 + 4*z)/(8*z^3 - 14*z^2 + 8*z - 2...

alrededor de 3 años hace | 1

Pregunta


Figure Control Buttons Out of Sync in Live Script
I'm running a live script. When I hover the mouse in the figure I the home, zoom out, zoom in, pan, and save buttons become vis...

alrededor de 3 años hace | 1 respuesta | 0

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Can I use a symbol as a variable?
Hi Prasenjit, Yes, you can do that syms m f = m^2 % expression that contains m as a symbol whos m % m is sym for m = 1...

alrededor de 3 años hace | 0

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How to plot frequency spectrum of a piecewise function in matlab?
Hi Daniel, Regarding this comment, the use of fftshift and the multiplication by dt both have to do with using the Discrete Fou...

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I want to find the filtered signal and remove the noise from the discrete received signal from the radar and convirte it to continuos
c2d (Control System Toolbox) or c2d (System Identification Toolbox) requires the first input be a dynamic system model. As far a...

alrededor de 3 años hace | 1

Respondida
I have an error when simulate a linear delay system with sliding mode control
Hi yousra, I'm not quite sure what the code is trying to do. However, the reason for the lsim error is pretty clear, and there'...

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How can I use the matlab function like fcn block
Hi titor7, The reason for the error in the original model show in this comment is because Simulink didn't have enough informati...

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Can't susbsitute a variable that is defined
Do syms C1 before calling subs. syms y(t) a eqn = diff(y,t) == a*y; S = dsolve(eqn) syms C1 subs(S,C1,2)

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Running simulink model with multiple values of a parameter, and then plotting multiple results on the same plot
Instead of, or in addtion to, the scope, send your data to a To Workspace block. Check out this doc page for an example of how ...

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Why does the step response to my discrete system not match between MATLAB and Simulink?
The explanation for the Simulink resutls is that the coefficients entered in the Discrete Transfer Function block don't represen...

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How to get state-space from a transfer funciton matrix
Don't use tf2ss. Check out ss instead to get started.

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linearize a non linear system
Normally, linearize is used to linearize a Simulink model. However, you may be interested in this Question first.

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Not simplifying to a usable answer
Hi Andrew, The answer key for Z1 appears to be incorrect. Also, I don't follow the equations you posted in the question. Anyw...

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Discrete input to continuous transfer function
Hi Luca, I'm 99.99% sure that the output of a block with a Discrete Sample Time is held constant until it changes. I know that...

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Output of a transfer function with input
The HeavisideAtOrigin should be 1 when using lsim M=2; b=14; q=20; num=[1]; G=tf(num,[M b q]); syms t F = 2*(heaviside(...

alrededor de 3 años hace | 1

Pregunta


Should this Symbolic Limit be Zero?
syms x a % complex by default syms n integer assume(abs(a)>abs(x)); assumptions limit(x^n/a^n,n,inf) Should that limit be z...

alrededor de 3 años hace | 1 respuesta | 0

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Pregunta


Can Symbolic Assumptions be Combined or Simplified?
Suppose I have a variable syms z and assumptions assumeAlso(abs(z) > 1); assumeAlso(abs(z) > 2); assumptions The only valu...

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Integral from 0 to inf with imaginary numbers takes too long
Hi BOSHU Here is my attempt. syms Kt Ks Cs M m to % overwritten later syms x Assume t is real, is that a good assumption? ...

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Respondida
How to make a simple plot with two lines?
Hi Macy, %table_a = readtable('Data1.xlsx'); table_a = readtable('https://www.mathworks.com/matlabcentral/answers/uploaded_fil...

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A matrix is passed into Simulink fromworkspace,Invalid workspace variable specified as workspace input in 'test03/From Workspace1'. Time values must be non-decreasing.
If img is a contstant matrix, don't use a From Workspace block. Instead, use a Constant block and set its 'Constant value' bloc...

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im trying to Find ∂z∂u when u=0, v=3, if z=sin(xy)+xsin(y), x=2u2+v2, and y=3uv.
Hi Matthew, Repeating the code from your comment clear; syms u v x y z ; %partial z z =sin(x*y)+(x*sin(y)); dzdx=diff(z,x)...

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A compact way to sum the elements contained in two cell arrays (considering the case of empty cells as well)
Would be easier if the first element of b weren't empty. Logic would need to be modified a bit if there is a possiblity that a c...

alrededor de 3 años hace | 2

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How to convert symbolic output to numeric value in Symbolic Math Toolbox?
My first inclination was to stay symbolic all the way through and then compute numerical values at the end. syms lambda mu sigm...

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it says Error in result(i)=piecewise_function(x(i)); result(i)=piecew
What should result be if x < 2 or if x > 5?

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Respondida
How to transform a second order ODE to the format xddot=A.X+B.U
Hi Ítalo, Let p = x and q = xdot. Then the standard, first order state space model is [pdot;qdot] = [zeros(n) eye(n); A zeros...

alrededor de 3 años hace | 0

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get the space states matrix in terms of output
Hi Vermeer, Based on this comment it sounds like you might want to pursue model reduction techniques. The Control System Toolbo...

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Effect of zero padding on FFT amplitude
This thread started with one question about zero-padding the Discrete Fourier Transform (DFT) and the answers and comments broug...

alrededor de 3 años hace | 2

Respondida
Pass input timeseries and block values into the sim command
Hi Yevgeniy Use a Simulink.SimulationInput object. More generally start from Run Simulations and follow the doc pages from ther...

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How to give a vector as input in Simulink, to solve a system of differential equations ?
Use a 1-D Lookup Table block with a Clock connected to its input. Use the y-array and its corresponding times to specify the ta...

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How to join matrices of different lengths into one mother matrix
Hi Joanne, If you want to store different size arrays in a single data structure you probably should consider using a container...

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