Mathieu NOE

Last seen: Today

Hutchinson

317 total contributions since 2015

Engineer - mechanices /ekectronics / signal processing

Average matlab user for 20 years now.
Professional Interests: signal processing, adaptive control, noise and vibration processing

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Answered
where is my fault ?
hello you were almost there - just split the code in main section and 2 sub functions %% main code %% hh=input("Enter the...

environ une heure ago | 0

Answered
Finding Peak Edges from Array of 116 Curves
hello I suggest to use the attached crossing function , with the y threshold corresponding the y value of the black line in yo...

environ une heure ago | 0

Answered
Plotting multiple Magnitudes in one plot
hello according to the picture, your code needed a revision, see below the bandwith of your filters (BW) should be proportion...

environ 19 heures ago | 1

Answered
Low pass filter VS high pass filter
hello you can do a bode plot of the transfer function between the output (signal filtered) vs the input (raw signal) use tfe...

environ 24 heures ago | 0

Answered
Input file editing format
hello I believe this code should work - I tested it only with loops = 2 even though I think you need to go up to 120 data = i...

1 jour ago | 0

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Answered
Filtering high frequencies from response signal
hello try also sgolayfilt function y=sgolayfilt(x,order,framelen,weights,dim) %SGOLAYFILT Savitzky-Golay Filtering. % SGO...

2 jours ago | 0

Answered
How to find the 80 and 20 percent positions on a gaussian profile - Penumbral width
HELLO Luis attached your code , beefed up with the attached function (computes the coordinates of crossing point of your data w...

2 jours ago | 0

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Answered
Looping until threshold is met
hello yes - error is not initialized , and BTW, you are shadowing a native matlab function error , which is not good pratice (...

2 jours ago | 0

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Answered
How to find the Zero Crossing Rate of a signal?
hello i am not sure what a "rate" can be about zero crossing, but at least maybe this code will give you access to zero or wha...

3 jours ago | 0

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Why is frequency of graph differing?
hi - official answer this time the PSD concept is valid only for random type signals , not sinus mathematically speaking, a ...

3 jours ago | 0

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Answered
Manual spectrogram creation without using spectrogram command
hello see below (myspecgram) %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % load signal %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %% data...

4 jours ago | 0

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Answered
modelfrf, experiment, naturel frequecies, magnitude
hello I plotted the time data for channels combos 3/4 (and 1/2) both shows single (low) frequency sinus type data - so this ...

4 jours ago | 0

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Answered
Trying to extract data from an assigned header
hello nothing fancy - but it works ! aa = readlines('data.xml') for ci = 2:numel(aa)-1 line = char(aa(ci)); ind...

4 jours ago | 0

Answered
Linear filter for echo effect
hello there is a very simple way to implement echo effects - see demo code below infile='DirectGuitar.wav'; outfile='out_ec...

4 jours ago | 0

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Answered
generate multiple text files from a matrix
hello see below data = [(1:1000)' 1000+(1:1000)']; for ci = 1: size(data,1) str = ['(' num2str(data(ci,1)) ',' num2s...

7 jours ago | 0

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Answered
How Do I Fitting a 3 Unknown Parameter Model?
hello Jordan see example below x = 0:100; N = length(x); tau = 10; % time scale of relaxation x_asym = 4; % relative inc...

7 jours ago | 0

Answered
How can I plot multiple 2d plots with a z value that changes the value of each line?
hello Alessandro check this please n = 3; z = [1 2 0.25]'; z = sort(z,'ascend'); x = linspace(0,10); y = z*x; dat...

7 jours ago | 0

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Answered
changing the name of multiple csv files in a folder
hello this is a first attempt I prefered to create the renamed copies in a separate folder also my code will probably need...

7 jours ago | 0

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Answered
bar plot with color bar
hello see code example below all the best clc clear all close all data = [.142 .156 .191 .251 0.5 0.86 2.2 4 8.3]; un...

7 jours ago | 0

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Answered
Specter of a square signal(10Khz) at 10MHz frequency
hello there is a much faster method to generate a square signal (using square ) see demo below for signal generation and fft...

8 jours ago | 0

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Answered
How to fix Index exceeds matrix dimensions error?
hello Philip I corrected some minor bugs in matlab function blocks also lambda_nom is not initialized so I took lambda_nom =...

9 jours ago | 0

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Scaning a txt file
hello Carolina this code will scan the file and search for the targeted variables you can expand (add more variables) if you ...

9 jours ago | 0

Answered
Edit Textfile for analysis
ok so my 2 cent suggestion to make that array looks nicer - lines = readlines('aba.txt','WhitespaceRule','trim'); ll_out ...

9 jours ago | 1

Answered
Need Help about FFT and STFT
hello see the code below for (averaged) fft analysis and spectrogram you can easily incorporate a test to select samples tha...

9 jours ago | 1

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Answered
read files and check if something is number
hello see the different options in code below my prefered one is the second a=readcell('test.txt',"Delimiter",":"); % % o...

9 jours ago | 0

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Answered
Plotting a random walk step by step
hello IMHO, the problem comes that x and y are not reinitialized (put to zero) when you start the next walk so I changed thi...

9 jours ago | 0

Answered
How to extract numbers from .dat file
hi again these are 3 options I tested for you ; i believe the second one is what you are looking for a=readcell('data.dat',"...

10 jours ago | 0

Answered
How to compare two frequency time graphs?
hello see below , we are generating a signal with 2 frequencies , then do fft for showing their frequencies. the time plot w...

10 jours ago | 1

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Answered
How to denoise a response to step forcing?
hello I tried 2 simple methods : sliding window averaging : not very effective to fit an exp model : will almost give the ...

10 jours ago | 1

Answered
using for loop plotting problem help me
hello I assumed that you wanted to plot I and error , but you forgot to index thos variables see below : f= @(x) 3*x^5+7*s...

10 jours ago | 0

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