# 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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**Content Feed**

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...

ungefär 20 timmar 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...

ungefär 21 timmar 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...

6 dagar 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 ...

7 dagar 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...

7 dagar 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 ...

7 dagar 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 dagar ago | 0

| accepted

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....

8 dagar ago | 0

| accepted

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...

8 dagar 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: ',"...

8 dagar 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 ...

8 dagar 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 dagar 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 dagar 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 dagar 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 dagar 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...

9 dagar 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...

9 dagar 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 dagar 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...

19 dagar 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...

19 dagar ago | 0

| accepted

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))...

19 dagar 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 dagar ago | 0

| accepted

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 , ...

20 dagar 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...

20 dagar ago | 0

| accepted

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 : ...

20 dagar 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 dagar ago | 0

| accepted

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...

21 dagar ago | 0

| accepted

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...

22 dagar ago | 0

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Plot two figures simultaneously

hi my suggestion with subplots close all clear all clc format long %% Data Layup Layup = [90 0 0 45 -45 0 0 -45 45 0 0 9...

22 dagar ago | 1

I need help plotting

hello this is the correct code Uan and Uab needs to be 2D arrays (n rows and columns as many as length(t)) also some missin...

22 dagar ago | 1

| accepted