Community Profile # 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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SELECTING MATRIX ELEMENTS IN DESCENDING ORDER
hello try this r = row index c = col index [value,ind] = sort(A(:),1,'descend'); [r,c] = ind2sub(size(A),ind)

ongeveer 12 uur ago | 1

Generating an average curve from 1,000 replicates of an ODE
hello I tweaked a bit your code. Your results can be stored in cells but as your y array has always the same dimensions, I fou...

ongeveer 13 uur ago | 0

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Plot line colors and legend colors don't match, & error bars don't show the points in the plot
hello again my friend ! this is your code a bit tweaked h1 = plot(x*100, avey1, '-ok',... : forcing the line color to b...

1 dag ago | 0

Export Audio with Volume Automation
hello Hans this is my suggestion fs = 44100; dt=1/fs; t = 0:dt:2; phi = 0; A = 1; f = 220.0000; x = A*sin((2*pi*f*t) ...

1 dag ago | 1

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How can i perform the for loop in this case?
hello not sure to have 100% understood the question but maybe this answer it ? I,believe it's simply about reshaping data -...

1 dag ago | 0

How to transform a vector that have "*" to indicate that a number is repeated
hello my suggestion : A='3*2 1 5*10'; As = split(A); out_all = []; for ci = 1:numel(As) B = split(As{ci},'*'); ...

1 dag ago | 0

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Spline interpolation of input data
hello check this not even sure the spline option is really needed here . A basic linear interpolation is good for the job ...

1 dag ago | 0

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hello again I think I already answred that question in your other post so again here - slightly modified as the input data fi...

1 dag ago | 0

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mean first 10 lines and next 10 line till finish array
hello try this %% dummy data data = rand(210338,3); % data must be column oriented (number of rows = number of samples) bu...

1 dag ago | 2

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I have a problem with indexing in nested for loop.
hello my suggestion motion_data = csvread("hip_test_6d.csv",1,1); hip_6d = motion_data(:,1:6); femur_6d = motion_data(:,7:...

1 dag ago | 1

Fitting Impedance data file to parallel RLC circuit model using fmincon
hello my attempt below - with just fminsearch (as I don't have the Optimisation Toolbox) I refined a bit the IC by manual...

4 dagen ago | 0

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Importing Excel from MATLAB
hello my 2 cents suggestion for looping over folders and files this can be further refined if you need an additionnal loop t...

5 dagen ago | 0

how to convert cell array to numeric array?
maybe this ? >> a = {'fh8453655'} >> beginStr = regexp(a, '\d+', 'match'); >> beginNumbers = cellfun(@(x) str2double(x{1}), ...

5 dagen ago | 0

I want to do fft analysis of the input signal but I am getting the following error
hello I had to tweak a bit my code because your data file does not have same amount of rows depending at which column we look ...

5 dagen ago | 0

error in computing log values
hello the "log" error was just a consequence of an algebraic loop of OutletEnthalpy bloc : (its input is dependant of the P ou...

5 dagen ago | 0

How to interpolate 3 matrices?
hello Federico this is my suggestion : I give a given RPM target value and serach for all points in the 2D array that are clos...

5 dagen ago | 1

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Calculating Mean, Median, STD from an excel documents that has 68 sheets and in each sheet there are 20 columns
hello Sophie you can do everything within the first for loop I assumed that the min/max / med / average computation muts giv...

6 dagen ago | 0

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EQ from measurement-data
hello maybe you should share the data file (measurements) and code if you have already started one once we have created the ...

6 dagen ago | 0

Seperating individual signal as a seperate matfile
hello you can adapt the code below to your own needs this demo shows how to use a threshold crossing detector to define star...

6 dagen ago | 0

Heatmap log colour scale: caxis() doesn't map values correctly?
hello no mre problem my friend ! % Create log values and generate heatmap dim = 10; x = logspace(-5,5,dim); values = re...

6 dagen ago | 0

Issue with load from text file with hex data
my 2 cents suggestion >> a = readlines('textfilename.txt') a = "0xd080 " >> b = hex2dec(char(a)) b = ...

6 dagen ago | 0

extracting one cycle from multiple sinusoidal waves
hello I used zero crossing interpolation method to select the last cycle of the data the extracted data are interpolated beca...

6 dagen ago | 1

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How do we plot graphs from excel file?
hello this is my suggestion, hope it helps clc clearvars fileDir = pwd; sheet = 2; % data must be retrieved from sh...

6 dagen ago | 0

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Using Spectrogram to Design a Filter
hello I checked your code and it's correct the beeper fundamental frequency is around 1000 Hz while the owl is around 300 Hz...

7 dagen ago | 0

Logarithmic Decrement and Damp Ratio
hello a very late answer to this question - siply because this code was reused in another post FWIW, this is the answer I alr...

7 dagen ago | 0

I need help with The logarithmic decrement, The undamped natural frequency ,The damped natural frequency ,The damping ratio please
hello this would be my suggestion - damping ratio of 0.4 is found coherent with the fast decay plot will show the two succes...

7 dagen ago | 0

Out of memory. The likely cause is an infinite recursion within the program. Error in polyfit (line 3) p = polyfit(x,y,2);
No issue so far on my R2020b copy pasted your data in my demo code and worked without issue : clc clearvars % data ...

7 dagen ago | 0

Why isn't my graph plotting correctly?
hello I have a bit modified your code , I had to replace viscircles with a similar function (cercle ) - but you can easily com...

7 dagen ago | 0