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Mathieu NOE


Last seen: Today

Hutchinson

308 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
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 hours ago | 0

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

18 hours ago | 0

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 ...

19 hours 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...

1 day 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...

1 day 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...

4 days 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...

4 days 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...

4 days 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...

4 days 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...

4 days 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...

5 days 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 =...

6 days ago | 0

Answered
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 ...

6 days 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 ...

6 days 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...

6 days 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...

6 days 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...

6 days 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',"...

7 days ago | 0

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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...

7 days 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 ...

7 days 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...

7 days ago | 0

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Answered
find the zero Value of a data
hello you use this function for detecting and ploting data crossing points threshold can be whatever value - not only zero ...

7 days ago | 0

Answered
Conditional statements on array.
hello Santos this is one way to do it split the input vector in 12 long extracts, then search for any value inside that is a...

7 days ago | 1

Answered
How do I import a column (f.e. C2:C37) of multiple Excel files into one vector in Matlab?
hello this is a simple code to load multiple excel (one sheet) data you can build your solution on this example file_list =...

8 days ago | 0

Answered
attenuate part of the audio
hello Sofia here some example below : %% example 1 : fading out the last 1 second of the wav file [Y1,Fs]=audioread('demo....

8 days ago | 0

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How can I obtain the right convergence number from what I have done so far??
hello this seems to work better - :) clc clear x = input('Enter the angle in radians: '); Count = 0; Estimate = inf; Pre...

8 days ago | 0

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Answered
How to create matrix with other matrixes by joining them?
hello here you are no loops res = zeros(2,2*size(a,2)); res(1,1:2:2*size(a,2)) = a; res(1,2:2:2*size(a,2)) = b; res(2,1:...

8 days ago | 1

Answered
Group data in specific potition (data redistribution)
hello back so I modified the code to respect empty sections - hope it helps ! % data1 = readcell('Input.xlsx'); data1 = ...

8 days ago | 0

Answered
Group data in specific potition (data redistribution)
Hello Ivan see below I added a 3rd line in your input file (just copied the first line) so that the output I generate can be...

11 days ago | 0

Answered
How to choose the right time and frequency vectors?
hello see example below : the notch filter simu is a bonus %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % load signal %%%%%%%%%%%%%...

11 days ago | 0

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