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Mathieu NOE


Hutchinson

Last seen: Today Active 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
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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Answered
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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Answered
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

Answered
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

Answered
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

Answered
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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Answered
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

Answered
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

Answered
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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Answered
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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Answered
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

Answered
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

Answered
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

Answered
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

Answered
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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Answered
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

Answered
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

Answered
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

Answered
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

Answered
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

Answered
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

Answered
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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Answered
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

Answered
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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Answered
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

Answered
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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Answered
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

Answered
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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Answered
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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Answered
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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