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
Answer 10 questions that were unanswered for more than 30 days
Awarded to Mathieu NOE on 08 Jul 2021
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Awarded to Mathieu NOE on 18 Mar 2021
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Awarded to Mathieu NOE on 17 Dec 2020
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Awarded to Mathieu NOE on 01 May 2020
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Content Feed
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 =...
11 hours 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...
12 hours 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...
1 day 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...
1 day 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...
7 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 ...
8 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...
8 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 ...
8 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...
8 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....
9 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...
9 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: ',"...
9 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 ...
9 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...
9 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...
9 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...
9 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...
9 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...
10 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...
10 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...
19 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...
20 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...
20 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))...
20 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 ...
20 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 , ...
21 days ago | 0
Variable vs constant frequency analysis
hello see my little demo below - no need for fft , I simply compute the cycle by cycle period (by crossing detection) on two s...
21 days ago | 0
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i need to find error in code because I it's increasing but it should be decresing
hi seems you have swapped the x and y data when you do the plot after the fix we get this : full code a bit improved : ...
21 days ago | 0
what's the code inside angle2dcm?
hello here you are notice that there are some issues / questions about orientation convention with this function angle2dcm3(...
21 days ago | 0
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Issue with magnitude of cumtrapz and integration of second order system acceleration data
hello accelerometer's signals double integration can be a bit tricky. We must compromise between being as accurate as possible...
22 days ago | 0
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Read the third column of a .csv file
hello you can use the import wizard to help you create the right import options for readtable see demo below - temperature is...
23 days ago | 0
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