Mathieu NOE

Last seen: Today

Hutchinson

378 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
How to find corresponding frequencies after viewing amplitude in descending order?
hello I modifed a bit your code and tested it with a two tone signal see the line with peak_fr_sorted_values clc %% dumm...

3 days ago | 0

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Answered
2d gaussian function
hello Lucy assuming your values are stored in A vector, use reshape to get the 848x480 pixels in matrix B : B = reshape(A,848...

3 days ago | 0

Answered
how to plot bar overall 1/3 octave by Poctave() as show below(bar color red)?
hello see example below : Fs = 44.1E3; xInp = rand(1,2^16); % Compute the octave spectrum of the same signal, but th...

3 days ago | 0

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Answered
Error when using sgolayfilt
hello Anna are you sure P1 is type double ? the code works on my side with dummy rand input P1 = randn(1112992,1); orde...

3 days ago | 0

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Answered
Dividing array to subarrays based on threshold
this is my 2 cent suggestion A=[0 1 2 3 4 3 2 1 0 1 1 2 3 7 8 4 3 2 1 0 1 2 4 8 9 6 3 2 1]; threshold = 2; ind = find(A>=t...

3 days ago | 0

Answered
How can I use loop to produce multiple graphs?
hello Daphne I modified a bit your code - see the comments only issue for me in line : Monthly_Temp = accumarray(Hindd_ck,...

4 days ago | 0

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Answered
Excursion of loudspeaker model is drifting massivly
HELLO I think I have an idea of where the problem lies... I first had a look how the non linear BL and suspension force equati...

4 days ago | 0

Answered
How to smooth plot without affecting the data. While I used smooth in plots, the data was reduced at some points.
hello to have a smoothed curved that goes closer to your input points, you have to interpolate first to have more data points,...

4 days ago | 0

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Answered
I get my peaks at the wrong frequency and with the wrong amplitude.
hello Anna look at my fft function at the end of my code clc %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % load signal %%%%%%%%%%%...

4 days ago | 0

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Answered
Non-linear Curve Fitting Issue with Experimental Data
HELLO I don't have the CF Toolbox but I could manage to get a reasonnable good fit by using 4th ordre polynomial fit on log lo...

4 days ago | 0

Answered
Bandpass filter vs sequential high and lowpass filter in Matlab: weird difference
I prefer this code ... faster and I know what filters I use i changed the input signal random + negative constant (to mimic you...

5 days ago | 0

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Answered
How to remove the mean from a data
hello you can simply do a = a - mean(a); NB : you can also use the detrend function

6 days ago | 0

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Answered
1/f amplitude spectrum and slope
hello Mercede Slightly modified code, simply give it a valid wav file name - it works as can be seen below - or where is your...

6 days ago | 0

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Answered
Creating a for loop that generates sound when given mean and standard deviation of frequency
hello Isabelle chek this ... you have now four wave files in your directory with different frequency beeps signals hope it hel...

6 days ago | 0

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Answered
50 Hz interference and noise reduction from ECG.
hello If you want only to remove the 50 Hz tone , use a notch filter as shown in example below. I used your data and guessed t...

6 days ago | 0

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Answered
spectrograme using STFT(DSP)
hello I was not comfortable with how you defined the basics constants in your code , so I rewrote it my way - I believe more r...

6 days ago | 0

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Answered
ERROR WHILE UPLOADING CSV FILE MANUALLY(BY IMPORT METHOD)
hello no issue found with your file . Could load it with readtable T = readtable('feed.csv'); T = 12×3 table ...

17 days ago | 0

Answered
Average of every n values in a matrix.
hello see 2 examples below , without and with overlapping sections % dummy data data = rand(320,15); buffer = 5; % nb of...

18 days ago | 0

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Answered
Remove leading blank space from specific lines in .txt files
hello my suggestion below , tested on following text (I added a last section for my testing purposes) Start; ...

19 days ago | 0

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Answered
How to create separate tables from a data set
hello here below my suggestion to split the large csv file into smaller txt files they may be smarter use of regexp but this...

19 days ago | 1

Answered
Concatenated Segmentation using Overlapping Windows
hello example below : % dummy data data = rand(80,5); shift = 5; % nb of samples for averaging buffer = 50; % nb o...

19 days ago | 0

Answered
How to circ_mean every 5 elements?
hello demo code below : % dummy data data = rand(320,15); buffer = 5; % nb of samples for averaging % zero overlap ...

19 days ago | 0

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Answered
how to import the result into excel file
hello see 2 methods example below : for k=1:10 xlswrite('Result.xlsx',rand(k),k); % option 1 writematrix(rand(k...

20 days ago | 0

Answered
Extract numeric data from cell
hello A = {'position: [0.5418702363967896, 0.0005752428551204503, -3.834952076431364e-05, 0.0, 0.0, 0.0]'}; A1 = regexp(char(...

20 days ago | 2

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Answered
Signal segmentation error: how to select a specific number of points before and after the ECG signal?
hello Ioana I modified a bit your code , hope it works before=100; after=140; nn = length(qrs_i_raw); % first and last bu...

20 days ago | 1

Answered
Excel reading all columns with a loop
hello again... based on my previous suggestion, this will do the trick : [filename, pathname] = uigetfile('*.xlsx', 'Bitte D...

20 days ago | 0

Answered
2D line plot xy with color from z variable
hello my 2 cents suggestion %___Read data___% data = readtable("Classeur1.xlsx"); %___Define variable___% %DAY = data.DAY;...

20 days ago | 0

Answered
Animated magnitude spectrum (windowed fft)
hello Joshua this is my suggestion / code below. It shows how to update the contents of a plot without (re)creating the entire...

21 days ago | 0

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Answered
How do I generate sound with durations and pause in between?
hello this is a demo to generate beeps with pause between % file = 'test.wav' ; f = 500; % f is the fundamental frequenc...

21 days ago | 0

Answered
Exponential decay, rate constant
hello this is a plain matlab example - i am not using the curve fitting tool here % generate some dummy noisy data x = 0:100...

24 days ago | 0