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# Aquatris

##### Last seen: 1 day ago
132 total contributions since 2018

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Plotting a 2 dimensional graph
What you are looking for is the "countour" function (or countourf) of Matlab. Check this link and you can adapty your equation t...

5 days ago | 0

One approach can be to fit a model to that table. For example; f = [0.1 0.125 0.16 0.2 0.25 0.315 0.4 0.5]; m = [62.4 97.2 1...

1 month ago | 0

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how to calculate the value of theta_k in terms of theta_i and theta_j
If you have symbolic toolbox, you can use something like this; syms a b c real % define a b c as real symbolic variables eq = ...

1 month ago | 0

Open Loop Time Response ?
Define your transfer function first. Then define your time vector. I have no idea what you want for input but I will use a nice ...

2 months ago | 0

How can I put a display that shows changing variables in a plot?
Assuming you plot in a for loop and the changing variable is x, below code will update the title of the plot to be equal to x f...

3 months ago | 0

How can i verify time step of excel files?
After you load the file in to matlab workspace, name the variable for time. Then you can use diff() function to find the differe...

3 months ago | 0

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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...

5 months ago | 0

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...

8 months ago | 0

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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...

8 months ago | 0

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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...

8 months ago | 0

how to add another x axis in a figure

8 months ago | 0

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...

11 months ago | 0

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...

12 months ago | 0

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...

1 year ago | 0

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...

1 year ago | 0

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...

1 year ago | 0

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),...

1 year ago | 0

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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 ...

1 year ago | 0

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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):...

1 year ago | 0

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. ...

1 year ago | 0

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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...

1 year ago | 0

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...

1 year ago | 0

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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...

1 year ago | 0

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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...

1 year ago | 1

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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...

1 year ago | 0

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...

1 year ago | 1

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); %...

1 year ago | 0

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...

1 year ago | 0

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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...

1 year ago | 0