# LO

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**Content Feed**

Question

change signal frequency by known freq step

Hi everyone, I would like to shift the frequency of raw sinewave data (around 600 Hz and recorded at sampling freq of 20kHz) of ...

en dag ago | 1 answer | 0

### 1

answerSimulation of electric fields

check this, maybe it helps https://de.mathworks.com/matlabcentral/fileexchange/42538-compute-induced-electric-field

6 månader ago | 0

Question

export MATLAB figure in PDF

I read several posts about this but I could not find a solution. when I try to export a figure to PDF it is saved anyway as BMP...

ungefär ett år ago | 1 answer | 0

### 1

answerQuestion

signal amplitude using FFT - conflicting results and misunderstandings

I am trying to measure the amplitude of different frequencies composing a signal using some code found here on this post. Using...

ungefär ett år ago | 1 answer | 0

### 1

answerQuestion

I moved files into a .... file and can't access them anymore :)

Hi all I used the function movefile (MATLAB 2018a). My file name is stored in the variable filename. I run the lines mkdir('f...

ungefär ett år ago | 0 answers | 0

### 0

answersHow to extract one element from array in function?

It is not clear what you want the function to do. What is t? and theta? If your aim is to apply a fixed transformation of thet...

mer än ett år ago | 0

Question

live operations on acquired data stream

I am trying to plot and make online calculation on analog data acquired through a national instrument device. I am using the fol...

mer än ett år ago | 0 answers | 0

### 0

answersHow to resolce callback error : asyncio.Channel/onDataReceived ....line(487):::

I had the same problem. Check if you have two listeners (or also function callbacks) aiming at the same data stream. For me tha...

mer än ett år ago | 0

Division of two Multidimensional array

you can iterate the 2D division A = rand(30,10,30); B = rand(30,10,30); sz=size(A); r = cell(sz(3),1); for i = 1:sz(3) ...

mer än ett år ago | 0

Can anyone help me on implementing gaussian noise on an ecg signal? If you want i can share my code. The problem is gaussian noise is 0 always.

I tried to fit some params, you can use the function wgn (white gaussian noise, see documentation) Fs = 20000; sig = 1/abs...

mer än ett år ago | 0

How to find the pole is oscillatory or not?

shouldn't an oscillatory system correlate with itself, with a certain periodicity ? try this https://de.mathworks.com/help/e...

mer än ett år ago | 0

How to concatenate elements of a cell array

if your cells are all of the same size, try using cell2mat (to convert your cell into array) and then reshape (to change the siz...

mer än ett år ago | 0

| accepted

Is there a way to only read every third row of a .csv file?

import the file and the use logic indexing, double check if it is selecting the right rows, if not just change the index array t...

mer än ett år ago | 0

| accepted

How to plot surface with contour form vertices?

try this https://de.mathworks.com/matlabcentral/fileexchange/5105-making-surface-plots-from-scatter-data

mer än ett år ago | 0

| accepted

Export axes error using app designer

have you tried using for each iteration saveas(gca,'figure.jpg') you would have to change the file name each time by adding a ...

mer än ett år ago | 0

Improve efficiency of elseif loop

You don't need the loops, you can use logical indexes. This will speed up the process.If your Power array has 1 dimension you ca...

mer än ett år ago | 1

| accepted

To Get Correct FFT Result the length(x) must be An Integral Multiple of 100?

the fft function will give you values as precise as the sampling rate of the signal. If it is a noisy signal, error can be cause...

mer än ett år ago | 0

Formula basic fitting curve Matlab

This is an excerpt from the help page of the interactive fitting function you are using: The polyfit function performs the tran...

mer än ett år ago | 0

| accepted

Data transfer between normal pc and MATLAB system through ethernet

https://de.mathworks.com/help/matlab/import_export/write-and-read-data-over-the-tcpip-interface.html

mer än ett år ago | 0

is there any function for CalinskiHarabasz just like silhouette(X,cidx) in matlab

yes, here load fisheriris; eva = evalclusters(meas,'kmeans','CalinskiHarabasz','KList',[1:6]) this is the usual silouhette pl...

mer än ett år ago | 0

How can I change graph label linearly to a time interval

you can create a time vector and plot it together with your data time = linspace(1,3000,3000) plot(time, rand(1,3000))

mer än ett år ago | 1

| accepted

How can I grab only certain files from a folder?

first create a list of the files, then check which one has the second last digit pair lower than 08, then copy it to a given fol...

mer än ett år ago | 0

| accepted

Heat maps with 3 variable

you can use the function "scatter3", if you have 3 variables (this will display a scatter plot of x and y and z on the 3rd axis)...

mer än ett år ago | 0

| accepted

How to split into small pieces of ranges of this graph?

this plots first the first half then the second subplot 211 plot(x(1:numel(x)/2),y(1:numel(y)/2)) subplot 212 plot(x(numel(...

mer än ett år ago | 0

Colormap appears darker on another plot, how to change that ?

you could change the colormap of your plot/s by adding (or subtracting) fixed values according to your needs k = 0.01; % factor...

mer än ett år ago | 0

| accepted

help with image threshold using bioformats

your threshold values are different among channels so it is not strange for the image to have "false colors". if you think ther...

mer än ett år ago | 0

| accepted

angle between two lines

FIRST you get the angle between white and blue (it does not matter which angle, the procedure is the same, you just have to adju...

mer än ett år ago | 0

CSV file reading and applying loop to plot graphs

first import one single CSV file and select coumns and rows of what you want usually to import. Generate the code by clicking t...

mer än ett år ago | 1

NI-DAQ device working on some PCs but not others

Have you tried uninstalling completely and reinstalling the NI-DAQ Data Acquisition Toolbox ? I have encountered troubles with ...

mer än ett år ago | 0

How to remove more than K consecutive NaN values from row matrix

K=2; x = [1,2,3,4,NaN,NaN,NaN,7,8,9] ; indexes=strfind(isnan(x), true(1,K+1)); x(indexes)=[]; (edited according to the comme...

mer än ett år ago | 0