# 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 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(...

1 dag ago | 0

| accepted

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...

1 dag 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...

1 dag 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...

4 dagen ago | 0

| accepted

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 ...

5 dagen ago | 0

| accepted

Load matrix from .mat files

hello try this : data_all = []; for ci = 1:10 filename = ['P' num2str(ci-1) '.mat']; data = load(filena...

5 dagen 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)'

5 dagen 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...

5 dagen 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));

5 dagen 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);...

5 dagen 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...

6 dagen 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...

6 dagen 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 ...

6 dagen 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 ^...

6 dagen 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...

6 dagen ago | 0

readcell command undefined?

hello again Amit i think I recognize this line of code... :) I believe readcell was introduced around R2018 - so if you have...

6 dagen ago | 0

| accepted

how to find the sample space of two or more peaks within a power delay profile

hello again this would be my suggestion to pic the two highest peaks inside each data bins , which are distant at least by 4 sa...

7 dagen ago | 0

| accepted

How to plot my sine waves in one graph, one right after another with 100ms in between and not on top of each other?

hello Kristin I fixed your code I prefered to use a constant fixed time increment for all frequencies instead of keeping the s...

7 dagen ago | 0

| accepted

Running a loop to generate multiple graphs using the same equation with different parameters

hello yes your code could be made more compact and flexible see my suggestion below clc clearvars t = linspace(0,5); ...

7 dagen ago | 2

| accepted

Identification of fundamental frequency and not harmonics in a FFT - using peak locations

hello try this of course I cannot plot the spectrum as this is not provided here I just let you see how to do the separati...

7 dagen ago | 0

| accepted

How to make an if-statement that finds whether a 1x5 column has 4 of the rows the value 0?

hello my suggestion below : matrix = [0 0 0 241 0]; ind1 = find(abs(matrix) == 0); % method 1 can be unpredictabe if val...

7 dagen ago | 0

Arrange average in same vector values

hello try this %% dummy data B = ([1 1 1 1 2 2 2 4 4 4 4 1 1 1 1 2]/8)'; % 2nd column data A = 100*rand(size(B))'; ...

8 dagen ago | 0

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Intergrating the data using a scalar value

hello see the doc for cumtrapz I believe you simply put the arguments in the wrong order it must be Int1 = cumtrapz(V,A1)...

8 dagen ago | 0

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easy and efficient way to create cell array or table from csvs or existing variables

hello this is my 2 cents suggestion clc clearvars %% first section : CSV file management fileDir = pwd; % Sorting ...

8 dagen ago | 0

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For looping figures creation

hello see example code below for listing and sorting filenames in natural order (what matlab does not do well by default) in ...

8 dagen ago | 1

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Reading a text file and then loop load audio files

hello again so this script will read the txt file where you have a list of wav file names then the loop will open the associ...

8 dagen ago | 0

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creating sine wave with variable frequency depending on variable

hello this is my suggestion - see attachement (R2020b) code for initialization : Fs = 1000; dt = 1/Fs; % angular table...

8 dagen ago | 0

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IIR Filter for loop Code

hello if you want to simply plot the bode diagram : Fs = 1000; % assumed for now ...sampling frequency b0 = 0.05 b1 = 0.03...

8 dagen ago | 0

| accepted

How to convert accelerometer data to find displacement graph

hello see my suggestion below clc clearvars data = csvread('data.csv',1); % time & Acceleration data t = data(:,1)...

11 dagen ago | 0

| accepted

how to read data from excel file

hello your csv file has one first row wit this header (name of 6 variables : lib,pc,ir_can,ir_us,un_can,un_us) data = csvrea...

12 dagen ago | 1