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Mathieu NOE


Last seen: Today

Hutchinson

368 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
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...

alrededor de 22 horas ago | 0

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

1 día ago | 0

| accepted

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...

1 día ago | 0

| accepted

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...

1 día ago | 0

| accepted

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...

1 día ago | 0

| accepted

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...

2 días ago | 0

| accepted

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 ...

13 días 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...

14 días ago | 0

| accepted

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; ...

15 días ago | 0

| accepted

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...

15 días 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...

15 días 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 ...

15 días ago | 0

| accepted

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...

16 días 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(...

16 días ago | 2

| accepted

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...

16 días 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...

16 días 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;...

16 días 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...

17 días ago | 0

| accepted

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...

17 días 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...

20 días ago | 0

Answered
Zero Crossing Rate plotting
hello again this is an improved code - no inner for loop needed clear all; clc; close all; %% Read the input signal [y, fs] ...

20 días ago | 1

| accepted

Answered
Zero Crossing Rate plotting
hello I am not aware of a function sgn in matlab , I believe this must be sign ? so this is modified and somehow I introduce...

20 días ago | 0

Answered
FFT Based Order Tracking
hello I was not able to understand the second part of your code If the target was to compute the RPM value vs time , look her...

21 días ago | 0

Answered
Steady state from data
hello Matthew see below : %Import data load('DCMotor_OL_Data_4.5V_A02.mat') % smoothin a bit the derivative theta_dot...

23 días ago | 0

| accepted

Answered
How do I extract the firing threshold value from an action potential phase plot?
hello again.... so my second submission for you today ! attached also 2 subfunction for crossing points computation and a be...

23 días ago | 0

| accepted

Answered
How do I set the threshold value on the action potential on the upward and downward slope to define width?
this is my first attempt to make it fully automatic based on this excellent submission (attached function) : Piecewise linea...

23 días ago | 1

Answered
Exporting simulation data in Multiple sheets in excel file.
hello see example below : for k=1:10 xlswrite('Result.xlsx',rand(k),k); writematrix(rand(k),'myData.xlsx','Sheet'...

23 días ago | 0

| accepted

Answered
Reading numerical data from text fles with string
hello my suggestion for the second part of your code , assuming you specify the lines to be read : n_lines = [10 11]; % defi...

24 días ago | 0

| accepted

Answered
How to create siren sound using makesound
hello You have to remember that the output is the sinus of an angle, which is the integral of frequency over time; so when f...

24 días ago | 0

| accepted

Answered
How to do discontinuous piecewise linear model fitting?
hello I combined : Piecewise linear least square fit - File Exchange - MATLAB Central (mathworks.com) and fminsearch to c...

24 días ago | 0

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