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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Content Feed
code to run multiple times in for loop
hello I guess you want something like that... here it's for laoding excel file but you can easily adapt it for mat files if ...
4 hours ago | 0
Outlining values of Stem FFT plot to create a trace profile.
hello FYI, this is a linear averaged FFT spectrum (one sidded) + enveloppe in red hope its helps clc %%%%%%%%%%%%%%%%%...
11 hours ago | 0
looping through 2 .mat files
hello had to modify a bit your code to make it work try this : clc clearvars % timestep = height(vel); % are not yet d...
1 day ago | 0
How to correct X and Y matrix to plot a curve that start at (0,0) as a original point?
hello try this clc clearvars skip = 1; data = csvread('highstrain(0.1s^-1).csv',skip); X = data(:,1); Y = data(:,2); ...
1 day ago | 1
how to identify and read positive and negative data from excel?
Hello try this - it also only need one call to readxls data = xlsread('Abb73at100.xlsx'); X = data(:,1); Y = data(:,2); X1...
1 day ago | 0
How to split data into cell
hello could not load your excel file , so I created a dummy one (attached FYI) the table is splitted into cells according to ...
1 day ago | 0
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Integration drift with numerical simulations
here one possible solution we want to have the signal not time distorted so we must keep with filtfilt even with the "bad" IC ...
2 days ago | 0
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sorting in linaire descending order
hello I generated some dummy data and tried to fit a linear curve , then searched for the data points closest to the mean curv...
2 days ago | 0
Break the for loop
hello I modified a bit your code so the condition were the two successive identical random r : n = 10; limitf = 0.1; F = z...
2 days ago | 0
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Detect main part of signal
hello If I were you I would do an envelop of your signal and use then the code below to detect the start and stop of the usefu...
2 days ago | 0
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Integration of the acceleration signal to obtain cumulate displacement
hello Federico check my code version : clc; clear all; close all; data=load("accelerogramma.txt");%carico i dati time=data...
3 days ago | 0
How to group specific values i several vectors following a condition?
hello IMHO, according to the rules , the result should be : res1 = [13,43,54], res2=[18,19,17,25.2] and res3=[59] and this ...
3 days ago | 0
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How can i know the best sampling rate to use in a ADC using Fourier
hello Fs is the inverse of the time increment dt clc; clear all; close all; dt = 0.0001; t1=0:dt:0.0025; VS= 5000; R1=...
3 days ago | 0
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How to identify when a continuous signal crosses a threshold value?
hello you can work from this example : clc clearvars n=1000; x=(1:n)/n; y = abs(sin(7*x))-0.5; threshold = 0; % you...
3 days ago | 0
iir filter for loop code
helo here you are clc clearvars c1 = 8; c2 = 2; c3 = 7; b0 = 0.05 * c1; b1 = 0.03 * c2; b2 = 0.02 * c3; a1 = 0.5; ...
3 days ago | 0
How to Find value inside a matrix that satisfies a condition and store that value in column 1 its corresponding row in column 2 and its column in column 3
hello sounds bit like a homework..? here your are : A = rand(5,5) [r,c] = find(A>=0.25 & A <= 0.5); for ci = 1:numel(...
10 days ago | 0
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how to calculate sum between cell
hello see example below : % example data for ci = 1:3 A{ci} = rand(1,7); end % do a horizontal sum B = sum(cell2m...
11 days ago | 0
How to normalize signal to have mean=0 and amplitude 0 to 1
hello if you are not confident how to use normalize , you can do the same thing by x = x - mean(x); % remove mean value (you...
11 days ago | 0
how to write a loop that finds the best fit value for each given input pair and plot all the resulted points?
hello Anitha so yes there was a small bug in your equations when you do the computation of A, you fliiped the terms (vs1.^2...
13 days ago | 0
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How to plot a marked point in a graph and connect it with other points?
hello this is a first attempt the outer lines was fairly easy to plot the two inner lines , it's a bit coded just to show ...
14 days ago | 0
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Load matrix from .mat files
hello try this : data_all = []; for ci = 1:10 filename = ['P' num2str(ci-1) '.mat']; data = load(filena...
14 days ago | 0
i have two different array holding some numbers, e.g; i have an array P containing 5 elements and other Q containing 6 elements. I want to find out P*Q matrix
P= [1 2 3 4 5 ]; Q=[8 9 5 7 3 4]; T = (P'*Q)'
14 days ago | 1
how to solve error using integral
hello integral works on function (handles) not arrays f is an array , not a function handle so use trapz to do numerical int...
14 days ago | 0
I have m*n matrix. I want keep only those rows whose atleast one element is greater than any specific value such as 1.
hello try this m = 3; n = 5; A= 1.15*rand(m,n); threshold = 1; a = A>threshold; rows = find(any(a, 2));
14 days ago | 0
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Sum specific elements of an array without using loop
hello Alex try this A = [1;0;0;0;0;1;1;1;0;0;0;1;1;0;0;0;0;0;0;1;1;1;0;0;1;0;0;1;0;0]; % 30x1 Array tic res = zeros(1,10);...
14 days ago | 0
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Half Power Method for Vibroacoustic Dataset
hello Daniel the frequency vector is missing the half power method is described here : Microsoft Word - 41FC527E-54FA-00270...
15 days ago | 1
How to calculate the response time of an instrument based on a second?
hello Kofial I did a few mods in your code ... but the response data of the instruments has little to do with the graph of the...
15 days ago | 0
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There is an apparent error in line 4, and this code only ran once
hello simply b and m are not yet defined when you do in line 4 : c2 = b*exp(t2*m); the code should be organized like this ...
15 days ago | 0
How do I output the values of a function in a vector string to plot a graph?
hello maybe this ? (tested OK on my side) clc clearvars A = 1; df = 100000; F = df/4; % n = 2^3; n = 2 ^ 3: 2^ 4 : 2 ^...
15 days ago | 0
Curve Fitting Tool - Power Fit
hello even without the curve fitting toolbox you can get a good match using fminsearch : sol = 1.4912 0.2802 clc...
15 days ago | 0
