# Jon

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**Content Feed**

How to discover the neighbor nodes in an matrix?

Here is a little example that I think does what you are asking % % assign threshold for being a neighbor dMax = 0.6; % mak...

circa 10 ore fa | 0

Finding a variable in a large table

Here's a simple example, which I think you could extend to your situation % make an example table name = {'fish','cat','dog','...

circa 10 ore fa | 0

How to build a function to make a working code more flexible?

The first thing you should do to greatly simplify your code and make it more flexible is to avoid using variable names with nume...

circa 14 ore fa | 0

Matlab doesn run the program , says at the editor 'input argument might be unused ' for t

If you have your odefun stored in it's own .m file then the syntax for calling ode45 is just [t,x]=ode45(@odefun,tspan,x0); F...

circa 15 ore fa | 0

I am trying to model solutions to a harmonic oscillator in physics using matlab and get "Array indices must be positive integers or logical values"."

The indices you are using in the expression x_array(t/dt+1) etc are not integers. MATLAB indexes arrays using either integer or...

circa 16 ore fa | 0

Two functions having the same name but one being capital?

While MATLAB is case sensitive, Windows (assuming that is your operating system) is not. Since MATLAB requires that function nam...

3 giorni fa | 0

| accettato

Help to plot a frequency response of a function

Here is a basic approach (not using any toolbox functions for frequency response), that might give you some ideas of how this ca...

3 giorni fa | 1

| accettato

why the coefficient of case 2 is 2 columns, not 5 columns? (about coefficient value of PCA)

By default pca gives the 'economy' option which only includes significant components. for pca(X) with X n by p using 'economy' ...

3 giorni fa | 1

| accettato

How can I generate a pseudo random column vector V

Yes this will make a random column vector of length N at each iteration. The values will be uniformly distributed between 0 and...

3 giorni fa | 0

Can someone help me open a Simulink file from an old version of matlab? (probably around year 2000)

I am able to open old Simulink .mdl files from around 1999-2000 using my MATLAB Simulink R2022b without taking any specific acti...

9 giorni fa | 0

Saving the timestamp for each iteration in an array

You had numerous errors in your code. A key one is that you were writing the sensor data and time to the same column (B1). Since...

9 giorni fa | 0

How to get z transfer function from difference equation?

I don't think there is any direct way to convert a difference equation to a transfer function in MATLAB. Maybe it is possible wi...

9 giorni fa | 1

Find the set of eigenvectors of a 4x4 matrix elements whose matrix elements have some VARIABLE PARAMETERS.

If I understand what you are trying to do I think this should do what you want. The resulting values of the eigenvector for eac...

28 giorni fa | 1

How can i plot this function? y=0.75/(log10(x)*2).^2

Something like this? x = linspace(1,10); % or whatever interval you would like change accordingly y = 0.75 ./(log10(x).^2).^2 ...

circa un mese fa | 0

Why do I receive "Index exceeds the number of array elements. Index must not exceed 7." when trying to remove indices that are followed directly by a zero using a for loop.

Your loop variable x goes from 1 to the length of the vector. In line 4 you try to assign vec(x+1), on the last iteration x = l...

circa 2 mesi fa | 0

Only the initial graph shows up

The problem is that you have an error in your line Error using legend Invalid argument. Type 'help legend' for more informatio...

4 mesi fa | 1

| accettato

How to simplify code with multiple variable names?

You can use arrays to hold your data. So one approach would be to use arrays: ma - n by 1 ea - k by n r - n by 1 ir n by 1 ...

4 mesi fa | 0

| accettato

Hello, I need help with: Replace elements in Vector A with those of vector B of the same position, only if they meet a certain condition, otherwise replace by a zero. Thanks

I like @Torsten's one liner and use of the multiplication times the logical zeros to null out the values where B is greater than...

4 mesi fa | 0

| accettato

My loop does not produce the results I want, due to coding errors

I have made numerous corrections in your code. I think this is now at least closer to what you want clc; clear; x0 = 0; y...

4 mesi fa | 0

| accettato

How to plot many figure with For function?

Uncomment the line in your code that assigns the figure number So for i=1:20 figure(i) plot(array(:,1),array(:,i)) end

4 mesi fa | 0

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How to solve a system of two linear equations in matrix form under a loop /

I'll assume you know how to calculate A and B based upon your c and T values. Then to solve for X use X = M\(J*A + B) Note tha...

4 mesi fa | 0

Bode diagram for a Butterworth filter

What specific problems or errors are you getting? Here is an example that maybe you can adapt to your situation fs = 1000; % sa...

4 mesi fa | 0

function for cell array

Here's a simple example % Make an example cell array with a vector in each cell A = cell(2,3); % preallocate for i = 1:2 ...

4 mesi fa | 0

| accettato

Write a function largest () such that it can accept multiple numbers and return the largest item from the given list.

There is already a MATLAB function that "can accept multiple numbers and return the largest one" x = [2,15,23.7,91.4,80.3] % ve...

4 mesi fa | 0

How can I plot a curve while changing color every N points ?

I was coding up the example below, and by the time I posted I saw you already had an answer from @Cris LaPierre. I will still in...

5 mesi fa | 0

| accettato

fprintf for ~million row string matrix

You could try writecell and see if that is more efficient.

5 mesi fa | 0

Plotting multiple .txt files

You could do something like what is shown in this simplified example % Get a list of all of the text files list = dir('*.txt...

5 mesi fa | 1

Loading .log data with different number of columns

Yes, I would also recommend readcell, so for example logdata = readcell('Example.log','NumHeaderLines',2) You could then mak...

5 mesi fa | 0

How can I use the ( nchoosek ) for this case nchoosek(x,y) where x=[1:1:80] , and y=64;

Using b = nchoosek(80,64) You will see that there are approximately 2.6958 E16 ways of choosing 64 elements out of your vecto...

5 mesi fa | 0

I have a 4 Dimensional Matrix and i want to get its transpose

You can use the MATLAB permute function for this and not use any loops https://www.mathworks.com/help/matlab/ref/permute.html

5 mesi fa | 1