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Aquatris


126 total contributions since 2018

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  • 12 Month Streak
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Answered
Plot a discrete signal
Here is one way; n = -5:0.1:5; index = [find(n==-3) find(n==-1) find(n==1) find(n==3)]; x = zeros(length(n),1); x(index) = 1...

2 months ago | 0

Answered
How to set different intervals using linspace()?
If you want to remove a certain element; x = linspace(1,100,1e3); % 1000 elements i = 100; % index to be remov...

4 months ago | 0

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Answered
error in subcript must real integers or logicals
If you run this portion ((idemod-1)*length(tmod)+1:idemod*length(tmod)).*cos(2*pi*fc*tmod) which you use as index, you will se...

5 months ago | 0

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Answered
How to exchange between X and Y axes in a 3D graph?
You can use a code like; h = findobj(gca,'Type','line') x=get(h,'Xdata') y=get(h,'Ydata') z=get(h,'Zdata') This will extrac...

5 months ago | 0

Answered
how to add another x axis in a figure
The answer is this link.

5 months ago | 0

Answered
How to Design a Full Order Observer in MATLAB?
place() function is for controller design not related to observers. The function finds a state feedback control law, u = Kx, suc...

8 months ago | 0

Answered
any input function to transfer functionm
I think the function you are looking for is lsim(). The usage is pretty simple. t = 0:1e-3:10; % time vector u = rand...

8 months ago | 0

Answered
State Space block state vector value
To do that you need to specify your states as outputs by modifying your C matrix. C = [1 2 3 4]; % original C matrix that giv...

9 months ago | 0

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how to design a notch filter in matlab
Here is one way; alpha= 2000; % determines the depth f = 650*2*pi;% notch filter frequecy (rad/s) x = 0.1; % no...

9 months ago | 0

Answered
modify axis in time series
You are not clear on what you want to do but from what I understand, you want to change the x labels from 0-2-4-6.. to something...

9 months ago | 0

Answered
FOR loop calculating next values using the previous values
Your for loop cannot go upto size(Xin,1). Imagine Xin has 10 elements. For calculation of M10, you would need to access Xin(11),...

10 months ago | 0

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Answered
Plotting contours of Z on an x-y axis where Z is not a function of x or y
You do not have a lot of data so the countour map will not look great. However what you need to do is; % create data x = [0.2 ...

10 months ago | 0

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Answered
How can i get fourier transform of this function
Here is a one way of doing it; clear;clc A = 2; f = @(t,t1,t2) A.*((t1<t) & (t<t2)); Fs = 1000; t = 0:(1/Fs):...

11 months ago | 0

Answered
about why in pole placement gives me error?
It is just the error says. Place command cannot place poles with multiplicity greater than rank(B). In your case, rank(B) is 1. ...

11 months ago | 0

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Answered
tfestimate gives different results for different Fs
It is because when you change the sampling time, you are basically playing with the fft of the signal. You should use Ts value o...

11 months ago | 0

Answered
My simulation is showing very small time not the total time period. Can anyone suggest the solution
In the setting of the scope (the gear symbol on the left top corner), there is a 'history' tab. In there remove the tick from 'L...

11 months ago | 0

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Answered
How to change load(resistance) while simulation is running
The easiest way is to use the switch block. You can either use simulation time to determine when to switch or define some condit...

11 months ago | 0

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Answered
bode plot from mass, stiffness and damping matrix
First of all, I think your M K and D matrices are not for a spring mass damper system. They do not have any negative elements in...

11 months ago | 1

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Answered
What is the purpose of Gmin and Gmax value in Hinfinty controller
From the function page you can find the information you need. I am pasting it here for convenience. --------------- Performanc...

11 months ago | 0

Answered
how to simulate an impusles response of a transfer function?
An impulse signal is a signal that has a certain magnitude that is applied for a small time. So you can use transfer function bl...

12 months ago | 1

Answered
How to realize a multiloop system in matlab?
Find below a simple example; A = rand(3); % random system A matrix B = rand(3,2); % random input B matrix C = eye(3); %...

12 months ago | 0

Answered
For loop for fibonacci series
In case of series, it is better to store each value. Please see below code that generatesa fibonacci sequence, and stores all th...

12 months ago | 0

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Answered
ODE function does not seem to work
First error is in sdof function. There should be a semicolon after c=1 and before m=3; k=3; c=1; m=3; Second error is in yo...

12 months ago | 0

Answered
How can I design a PID Controller to stabllize the plant 1/(s^3+1) ? [beginner]
So you have a transfer function G(s) = 1/(s^3+1) and you want to find gains P,I,D for your controller K(s) = P+D*s+I/s. As commo...

12 months ago | 1

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Answered
MIMO ss2tf, how do I apply it to a 3x3 system?
You can try using just tf (if you are using one of the newer versions of Matlab) sys = ss(rand(6),rand(6,3),rand(3,6),0); %...

1 year ago | 0

Answered
Plotting circle using angle and radius
Next time, share your code so that we can debug your code. My guess is you angle are from +90 degrees to -90 degrees instead of ...

1 year ago | 0

Answered
Forced step response of a signal
I recommend you look into <https://www.mathworks.com/help/control/ref/lsim.html lsim()> function, which is a lot more flexible t...

1 year ago | 0

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Answered
Index exceeds number of array elements (1)?
You only define V2(1) in your code and do not increase the size of the V2 variable. So I think you are missing a code in your fo...

1 year ago | 0

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Answered
How to subplot data in a given order?
Below modification will make the subplot in the order presented in the ch_order variable. ch_order = [6 4 2 1 3 5]; fo...

1 year ago | 0

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Answered
how can i find Open loop Transfer Function from Closed loop Transfer Function
From the basics of control theory you should know that for a given system G(s), the closed loop transfer function with unity fe...

1 year ago | 2

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