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LO


Last seen: 6 days ago |  Active since 2018

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MATLAB
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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 ...

6 days ago | 1 answer | 0

1

answer

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

6 months 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...

1 year ago | 1 answer | 0

1

answer

Question


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...

1 year ago | 1 answer | 0

1

answer

Question


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...

1 year ago | 0 answers | 0

0

answers

Answered
How 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...

1 year 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...

1 year ago | 0 answers | 0

0

answers

Answered
How 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...

1 year ago | 0

Answered
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) ...

1 year ago | 0

Answered
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...

1 year ago | 0

Answered
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...

1 year ago | 0

Answered
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...

1 year ago | 0

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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...

1 year ago | 0

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Answered
How to plot surface with contour form vertices?
try this https://de.mathworks.com/matlabcentral/fileexchange/5105-making-surface-plots-from-scatter-data

1 year ago | 0

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Answered
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 ...

1 year ago | 0

Answered
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...

1 year ago | 1

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Answered
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...

1 year ago | 0

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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...

1 year ago | 0

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Answered
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

1 year ago | 0

Answered
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...

1 year ago | 0

Answered
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))

1 year ago | 1

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Answered
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...

1 year ago | 0

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Answered
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)...

1 year ago | 0

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Answered
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(...

1 year ago | 0

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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...

1 year ago | 0

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Answered
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...

1 year ago | 0

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Answered
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...

1 year ago | 0

Answered
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...

1 year ago | 1

Answered
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 ...

1 year ago | 0

Answered
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...

1 year ago | 0

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