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Mathieu NOE


Last seen: 2 days ago

Hutchinson

481 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
Reading data from multiple files in ascending order.
hello this is my suggestion , based on natsortfiles (from FEX : Natural-Order Filename Sort - File Exchange - MATLAB Central ...

2 days ago | 0

Answered
How to specify order of a Moving Average Filter?
hello a moving average filter has only a window length (and window type) as parameters, the order is not meaningfull here may...

2 days ago | 1

Answered
Hysteresis curve and envelope
hello Emily this is how I solved it (blue curve) hope it helps %Column 2 Force vs Displacement clc;clear;close all; %Tra...

2 days ago | 0

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How can specify interval of variables in fsurf?
hi see 'MeshDensity' — Number of evaluation points per direction Control Resolution of Surface Plot Control the resolution o...

4 days ago | 0

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Answered
Reduce the error formed due to unexpected condition in time series data. Time series correction
hello see some suggestions for data correction and smoothing in my code below hope it helps all the best clc close a...

4 days ago | 0

Answered
How to plot these traces after a fixed interval?
hello this is it : C = randn(2000,30); data = filter(ones(1,100),1,C); ind = [5, 15, 25]; % your angles figure(1), w...

5 days ago | 0

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FFT and time domain
hello see my example below I used nfft = 48 and 95% overlap to have best display of spectrograms clc clearvars %%%%%%%%...

5 days ago | 0

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How to plot the “Response” and the “damping exponential function of the transient solution” on the same figure?
hello If you have the Signal Processing Tbx, envelope was made for you clear all;close all; clc; xss=0.01; wf=40; wn=2...

5 days ago | 0

Answered
I have multiple signal plots in one graph and i want to add their amplitudes to get one graph only
hello here you are : n1=1.45; n2=2.65; c=299792458; a=259*10^-9; b=142*10^-9; G=a+b; Lambda0=1.5*10^-6; Omega0=2*pi...

5 days ago | 0

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Answered
Finding the time in which a specific value is reached in time-series data when peaks are found
hello I would suggest you use first a lowpass filter with long enought time constant (equivalent to moving average with buffe...

5 days ago | 0

Answered
How do I solve two different differential equations at the same time?
hello to do simple integration, you could start with cumtrapz to get the velocity data (from the force inputs) the time vecto...

5 days ago | 1

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How to use output numbers as a vector.
hello see bleow : clear variable clc a=input('Please input a vector of integers : '); c=length(a); for d = unique(a(:)) ...

5 days ago | 0

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How do I fix my x-axis ?
hello here you are : x = 0:1e-3:2; y1=8*cos(2*pi*x); y2=8*cos(19*pi*x).*exp(-x); figure(1),plot(x,y1,x,y2)

9 days ago | 1

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Answered
Write legend on for loop plot
hello try this : X = [1.182, 1.6, 1.7, 1.8, 1.9, 2] NumberOfScenarios = [1, 2, 3] Scenarios = string(NumberOfScenarios); ...

12 days ago | 1

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Answered
Find the value at exact location in a text file
hello hope this helps I used the attached function to load the data (FYI) % demo clc clearvars; % load data [outdat...

12 days ago | 0

Answered
ECG signal filtering problem
hello a little tool to do the fft anamysis (and notch filter demo included) clc clearvars %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%...

12 days ago | 0

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How analyze PMU data in the form of sinusoidal waveform?
hello I am not sure what your data represents, but FYI, this is a code to do spectral analysis (averaged fft and spectrogram) ...

12 days ago | 1

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Answered
How to smooth a curve
hello your post is a bit rude, please take 10 seconds to say hello and introduce your topic; that would be a little more respe...

12 days ago | 0

Answered
How to resample frequency domain signal?
hello first code below : this is a script showing true averaging (even on complex Y data) over N samples your ac...

13 days ago | 0

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Answered
Echo generation of FIR sytem
hello my code as example : infile='DirectGuitar.wav'; outfile='out_echo.wav'; % read the sample waveform [x,Fs] = audiore...

13 days ago | 0

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Answered
Including Distortion with Audio Signal
hello this is an example how to use your function within a main code but I guess the implementation for the distortion is not...

13 days ago | 0

Answered
How can I offset time and displacement at the end of a defined time?
hello you can simply add 60 (or any value ) to your time vector (assuming you have defined one) : plot(time+60,data)

13 days ago | 0

Answered
Best filter for velocity noisy data
Suggestion of the day there are certainly other ways to implement a filter that action is function of signal amplitude (or dev...

16 days ago | 0

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Answered
implements a digital notch filter to remove the frequency component at 1 Hz.
hello see example code below clc clearvars %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % load signal %%%%%%%%%%%%%%%%%%%%%%%%%%%...

16 days ago | 0

Answered
how to shift a pcolor figure ?
yes for sure % non centered plot N = 21; X = (1:N); Y = (1:N); C = rand(N,N); figure(1),pcolor(X,Y,C) colormap(gray(2...

17 days ago | 0

Answered
Specgram zooms when sampling rate resampled to lower
Complete code for audio signal analysis clc clear all %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % load signal %%%%%%%%%%%%%%%%%%%...

17 days ago | 1

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Answered
Why does my FFT return all zeros for certain sound files?
Luke - see above again : I found where the issue is on the OP code - N = 2^12; j = 0:N-1; f = (Fs/N).*j; X = ff...

18 days ago | 1

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Answered
Smoothing data by x axis values rather than cells
hello to resample all data to 200 m resolution (whatever your resolution is ), simply use interp1 : new_d = min(d1):200:max...

18 days ago | 0

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Answered
Moving sum of 4 subsequent observatins
hello see example below (run it with 4 and not 5 samples averaging) : % dummy data data = rand(320,15); buffer = 5; % ...

18 days ago | 0

Answered
I want to call multiple files and plot them using a loop
hello attached a few examples - they are for excel / csv files but you can easily change the code for mat files (like : ... = ...

18 days ago | 0

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