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Mathieu NOE


Last seen: Today

Hutchinson

501 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
Displacement from accelerometer data
hello the drift in the displacement is due to the fact that the velocity itself is not a zero mean signal so if you are inte...

14 minuter ago | 0

Answered
How to fscanf a text file of characters to a string array/vector, but not a 1x1 string?
hello try this : fid=fopen('sample.txt', 'rt') data=split(fscanf(fid,'%c')) fclose(fid); % gives : data = 6×1 cell a...

21 minuter ago | 0

Answered
Plots giving me straight lines instead of harmonic oscillation lines
Hello there were some bugs ... where to start ? first the way you order the recursive equations can have some importance us...

ungefär 6 timmar ago | 0

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Answered
Trying to plot my bandpass filtered signal in a time series, but I need to divide the x values by 2000 (the sampling rate) to get it to plot in seconds instead of samples/seconds
hello Rachel in most of my matlab code, I have to get the samples amount and define explicitly the time vector like this samp...

ungefär 22 timmar ago | 0

Answered
only reading and plotting data for one file while I want it to read and plot data for 12 files
hello all plots are updated at each loop iteration on the same figure(1) so at the end you have only one figure showing the la...

ungefär 23 timmar ago | 0

Answered
How to smooth a graph?
hello see below some examples of how to smooth data; plenty of possibilities... Fs = 1000; samples = 1000; dt = 1/Fs; t = ...

ungefär 23 timmar ago | 0

Answered
How can I find when a signal stops oscillating more than a certain value?
hello sure it's doable use the attached code example to do a first derivative of your data, and then find the first index of...

ungefär 24 timmar ago | 0

Answered
Getting the Fundamental Frequency from Line to Line Voltage without distorting the signal.
hello I have not really understood what the purpose of Y data from the figure was, but I guessed that the plan was to get the "...

en dag ago | 0

Answered
read each line a text file using Matlab function
hello Nadia if you use readvars, you have to know / specify how many variables you want to output example , if I specify on...

en dag ago | 0

Answered
while loop in a for loop
hello again official answer below : code fixed !! the output of the function was incorrect (wrong index and not at the right...

3 dagar ago | 1

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Answered
Zeros between Sign Change of Values in column
hello this is my suggestion below + see attachements data = importdata('data.txt'); x = data(:,1); y = data(:,2); thr...

8 dagar ago | 0

Answered
I want to do loop operation of these files but fail to get the desired result. Can anyone help me to figure out the problem?
hello I tweaked a bit your code , if fact it was simpler in my opinion to do the full 4 x 4 loops instead of doing the specifi...

8 dagar ago | 0

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Answered
Assign same linewidth to a grouped barplot
hello v1=rand(10,1); v2=rand(10,1); x=[1:10]; combined=[v1,v2]; barplot=bar(x,combined,'grouped'); barplot(1).BarWidth = ...

8 dagar ago | 1

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Answered
Generate Frequency domain with FFT function of 3-axis accelerometer data
hello see this example - you can adapt it to your own needs all the best %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % load s...

8 dagar ago | 0

Answered
Remove rows from table identified in a second string array
hello Christopher thi would be my suggestion notice I changed the last 3 names in Post_Inflate_names to get a matching case ...

9 dagar ago | 0

Answered
Fit an exponential function to time-series data
hello this is the poor man solution without any toolbox data was stored in txt file your B = -1/b_sol from my code below ...

9 dagar ago | 1

Answered
How to identify datasegments that correlate to a given frequency
hello Katy I built this on your code, so first option is to see if the time interval between consecutive peaks are similar or n...

9 dagar ago | 0

Answered
Rename dynamically columns name of a vector inside of a for loop
hello Sara if you stick to the eval method , this is how you should code it : eval(['d_' num2str(kk) ' = d;'])

9 dagar ago | 0

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Answered
How can I change the color of the face of a cube created using the slice command?
hello use handles to modify face colors here I changes all external faces to black [X,Y,Z] = meshgrid(0:3); V = X.*exp(-X....

9 dagar ago | 0

Answered
How do I add noise to a sine wave signal to get the output below
hello simply the time vector was not correct , just define it once for all plots (and with max value = 10 s and not 1 s) als...

9 dagar ago | 1

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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 ...

13 dagar ago | 0

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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...

13 dagar ago | 1

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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...

14 dagar ago | 0

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Answered
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...

15 dagar 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...

15 dagar 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...

16 dagar ago | 0

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

16 dagar ago | 0

Answered
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...

16 dagar 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...

16 dagar 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...

16 dagar ago | 0

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