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
Accept 1 answer given by other contributors
Awarded to Mathieu NOE on 18 Mar 2021
100 of your answers have been accepted
Awarded to Mathieu NOE on 17 Dec 2020
Provide your first answer ever to someone else's question
Awarded to Mathieu NOE on 09 Jun 2020
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Awarded to Mathieu NOE on 01 May 2020
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Awarded to Mathieu NOE on 09 Oct 2019
Content Feed
Import Labview Text file with lines of text above a two column data set
hello there are 10 header lines in your file (attached for double check) code is simply : >> data = readmatrix('Data.txt',...
5 días ago | 0
plotting 3 figures in a single figure when they are in loop
hello see my suggestion below (based on dummy data as you don't supply any file) notice that to compute the velocity and acc...
5 días ago | 0
| accepted
How to sum of loop elements?
hello I opted for a bar graph of the summed data I changed the Y scale to log otherwise you could not see the tiny values as...
6 días ago | 0
Move all statements after the function definition to before the first local function definition
hello put all functions at the end , after the main code this works now : clear all; close all; clc; % calculate alpha m ...
6 días ago | 0
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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...
8 días ago | 1
| accepted
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;
9 días 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...
10 días 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...
10 días ago | 0
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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 = ...
10 días 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 =...
10 días ago | 0
| accepted
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...
10 días ago | 0
| accepted
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...
11 días 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...
11 días ago | 0
| accepted
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...
17 días 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 ...
18 días ago | 0
| accepted
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...
18 días 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 ...
18 días 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...
18 días 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....
18 días 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...
18 días 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: ',"...
19 días 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 ...
19 días 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...
19 días ago | 0
How To Approximate Data With Model
hello maybe this ? clc clearvars realdata=readmatrix('RATM.csv'); Year=realdata(:,1); realgA=realdata(:,2); TFPmodel...
19 días ago | 0
| accepted
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...
19 días 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...
19 días 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...
20 días 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...
20 días 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...
29 días 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...
30 días ago | 0
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