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# Aquatris

Last seen: 10 månader ago Active since 2018

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how to store data for second looping
One way would be to use a 3D array for dataA variable or; for z=1:1000 for i=1:20 x(i)=rand; y(i)=2*x(i)...

ungefär 2 år ago | 0

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How to plot every column of matrix into a different graphic but in one figure
This might be what you are looking for A = rand(13,4); % random 13x4 matrix [r,c] = size(A); % get number of rows and columns ...

ungefär 2 år ago | 1

plot 2 different y-values for the same x-value in box plot
You are looking for the "bar" function. If you also need the error bars, check out this answer from a previously asked question....

mer än 2 år ago | 0

plotting an array skipping some columns
If you know which columns you want; desiredColumnIndex = [1 23 35 67 70 83]; plot(x,T(:,desiredColumnIndex)) If you want ever...

mer än 2 år ago | 1

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Code for FFT analysis
You should check the FFT function site. Everything you need is there. Here is the link.

mer än 2 år ago | 0

How can I index elements by their sorted positions?
Sort has a second output that is the index; [B,I] = sort(A); such that A(I) = B; From there, I is the C_ matrix you are looki...

mer än 2 år ago | 0

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Processing EMG data in MATLAB?
I think you are looking for the function cumtrapz, here is the link.

mer än 2 år ago | 0

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How do I get the transfer functions in a MIMO transfer matrix in Matlab
Once you obtain the system model G, you can call any input-output pairs as you like as if you are dealing with matrices. outpu...

mer än 2 år ago | 0

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Plot all four functions
It only plots the first one because your Zeta is always 1 (c/cc = 1). Moreover, even if you changed Zeta to be other values, it ...

mer än 2 år ago | 1

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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...

mer än 2 år 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...

mer än 2 år 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 = ...

mer än 2 år 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 ...

mer än 2 år 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...

mer än 2 år 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...

mer än 2 år 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...

nästan 3 år 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...

ungefär 3 år 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...

ungefär 3 år 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...

ungefär 3 år ago | 0

how to add another x axis in a figure

ungefär 3 år 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...

mer än 3 år ago | 2

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...

mer än 3 år 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...

mer än 3 år ago | 1

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...

mer än 3 år 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...

mer än 3 år 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),...

mer än 3 år 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 ...

mer än 3 år ago | 1

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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):...

mer än 3 år ago | 0