Mathieu NOE
Hutchinson
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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Contribute at least one answer each month for 12 consecutive months
Awarded to Mathieu NOE on 02 Oct 2021
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Awarded to Mathieu NOE on 08 Jul 2021
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Awarded to Mathieu NOE on 18 Mar 2021
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Content Feed
Data analysis from measurements (PRBS injected to a system -> how to plot the bode of the system response)
hello see my suggestion below (data in attachement) clc clearvars data = load('beam_experiment.mat'); x = transpose(data...
10 hours ago | 1
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How to convert to nan
hello try this FF= [1 2 3 4 5; 6 7 8 9 10; 11 12 13 14 15]; [i,j] = find(FF > 0 & FF < 10); FF(i,j) = NaN;
1 day ago | 0
How is frequency response calculated as function of sample data frequency?
hello so h is a FIR filter see code below for Bode plot and time domain simulation on sine wave at 30 and 25 Hz (the notch f...
1 day ago | 0
Drift in cumtrapz forceplate data
hello yet another example of accelerometer / signal integration drift using cumtrapz. I see you removed the mean value of th...
1 day ago | 0
How to find the index of the first absolute minimum entry of a matrix
hello here you are my friend A=[5,7,0.5,5 ; 2,0.5,4,1 ; 0.5,6,7,9] [val,ind_linear] = min(A,[],'all','linear'); % M = ...
1 day ago | 0
Summation with for LOOP
hello a simple add on to your code : clear clc x = linspace(0,50,1000); v = 10; a = 0.2254; b = 0.5401; xT = 0; ysum =...
2 days ago | 0
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change marker color based on the values
hello my suggestions below S = 35; % size of symbols in pixels % normalize vector to go from zero to 1 normV = (B(:,3)-m...
2 days ago | 0
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How to FFT my xlsx files from time domain to frequency domain?
hello see my demo below now your signals look like a bunch of spikes so I wonder what you expect from the fft analysis ? c...
3 days ago | 0
How to make the postions of each circle random?
hello maybe this ? - as far as I understand you simply want to generate random center position for the circles ? % Set the r...
3 days ago | 0
How do i count the signal within a certain time interval?
hello below a demo code that look for crossing point between a chirp signal. We detect both the positive and negative slope cr...
9 days ago | 0
Calculate peak of pulses above certain threshold
hello @Chunru : why the envelop ? this can create enough signal distorsion so that the peak instant is misread. I understand ...
10 days ago | 0
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Find the max width of a peak
hello Nigel maybe there is some way to make findpeaks compute the prominence in a manner that better works on this example , b...
10 days ago | 0
How to extract time period of sensor signals
hello see my demo below - for constant and non constant frequency signals. the last plot shows the time diffeence between the ...
10 days ago | 0
table import in more columns
hello maybe this will help you to get your data as you want : load('ModellDDOKLL2table.mat') C = table2array(ModellDDOKLL2t...
10 days ago | 0
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User input compared with excel sheet data and returns best fit
hello was a nice recreation task.... here a small demo (the excel file is attached) % Import the data data = readcell("CARS....
10 days ago | 0
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Curve fitting for jonscher power law
hello my suggestion - and because I don't have the Curve Fitting Tbx, simply with fminsearch i prefered to look at the data i...
11 days ago | 1
I keep getting undefined input error
hello you want to request a string not a number , so the correct code is : Grade = input('Enter letter grade for course: ',"...
11 days ago | 1
Estimation of Pitch from Speech Signals Using Autocorrelation Algorithm
hello this is a modified version of the code . The autocorrelation ouput will have a major peak at sample = M (x axis) and is ...
11 days ago | 0
How can I create a for loop using simulated data for the start of frequency analysis?
hello see code correction below ; there is only one for loop as we add the new signals on the 60 Hz + noise signal created bef...
11 days ago | 0
How To Approximate Data With Model
hello maybe this ? clc clearvars realdata=readmatrix('RATM.csv'); Year=realdata(:,1); realgA=realdata(:,2); TFPmodel...
11 days ago | 0
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Content and rate of change in a buffer
hello IMHO, the non uniform x spacing is prone to bug - so I prefered to resample the data with constant x spacing . Now I w...
11 days ago | 0
How to use readtable when skipping every second (non-data) line?
hello try this T = readtable ('samplefile.txt', 'NumHeaderLines', 8,"Delimiter",' '); [m,n] = size(T); select_rows = 1...
11 days ago | 0
how to obtain the impulse response of halfband FIR filter
hello by definition H1 array is your impulse response (a FIR filter coefficients array is its impulse response) clc; close...
12 days ago | 0
This code shows the FIR filter magnitude response with the normalized frequency from 0 to pi, how i can make mirroring of this magnitude response to start from -pi to pi ??
hello here you are (nothing fancy !) clc; close all; clear all; n1= 15; %order Fs= 100; %sampling frequency fc= Fs/4; %c...
12 days ago | 0
getting an error in this code
hi here you are sx = (1:8); px = [0.15*ones(4,1), 0.1*ones(4,1)]; gx = (sx<=5).*(105*sx-5*(sx.^2)) + ((sx>5).*500); sy = u...
21 days ago | 0
How to constraint the values of fitted parameters with lsqcurvefit?
hello I admit, my solution is the "poor man" solution as I don't have the optimization toolbox. But even with fminsearch I cou...
22 days ago | 0
How to calculate the width where the intensity is higher than 20% of the maximum intensity?
hello Angelo I have no doubt you can use findpeaks but sometimes I prefer my own way. see demo below - this is to find W20...
22 days ago | 0
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how harmonic estimation using DFT ?
hello yu can take example on the code below (averaged fft spectrum and spectrogram (this my not be your main focus right now))...
22 days ago | 0
Math Moron here in need of a function to simulate a degrading curve over time.
hello maybe this ? (the idea behind is a sigmoid) samples = 100; c = samples/2; % center of the curve (c corresponds to ...
22 days ago | 0
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How to extract column in particular interval from original matrix and to form new matrix?
hello I guess you mean you want to downsample your data by a factor 4 ; you can of course simply pick one every four sample , ...
23 days ago | 0
