Mathieu NOE

Hutchinson

Last seen: 1 day ago | 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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For each peak, I would like to calculate the delta (shown in image) for the plot in the script at each threshold level in a table.
hello seems to me the code is fine for one single value of Strain because then X and Y have same size as soon as you have mul...

2 days ago | 0

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Cut Audio Signals (.wav) in specific time.Create a repeat loop to reach the desired time
hello try this I tested the code for mono and stereo wav files - should work even for more channels data now please notice ...

3 days ago | 1

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How to start loop when it finds the first maximum
hello this code does work maybe simply you have to pay attention that such condition statement may not work well simply beca...

3 days ago | 0

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change signal frequency by known freq step
hello try this I assumed you wanted the output signal also sampled at 20 kHz % create some dummy data (as it if was a recor...

3 days ago | 0

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plot running time complexity
you need your n start at zero and not 1 to see n^2 and n^3 curves below curve y = 1 and y = n n = linspace(0,2); f1 = n.^n...

3 days ago | 2

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How to grab specific value in txt data?
hello try this : D=readlines('2022_01.txt'); % read as string array % find the time and date lines ...

4 days ago | 0

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Answered
How to apply Butterworth filter to an inertial signal metrics?
hello this is a demo code (with 3 channels dummy data) that will display time and averaged fft plot it includes banpass and...

5 days ago | 0

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Read images based on datetime
hello Sigmund this is a starter .... In the middle of my brainstorming I was momentary worried that in 'Struct' the filename ...

8 days ago | 0

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how to separate a large text file into individual text files based on date, but also export headers?
So here we go A code that is certainly not as refined as StarStrider's .... filename = 'Gwynedd_1992.txt'; [outdata] = readc...

8 days ago | 0

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How to generate Image from Raw Data and find Peak Value
hello try this code below the peak coordinates are stored in xmax and ymax for one single peak , max is sufficient; if you ...

8 days ago | 0

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I need to plot circles with different radius and centers .Also I need to extract that information of centers and radius.
hello no need to use meshgrid here (why ??) try this instead the centers and circles are plotted with same color here (bu...

9 days ago | 0

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Area Normalize EPR Spectra
hello I presume that negative signal area should aslo be counted as positive area so this line is wrong AreaUnder...

10 days ago | 0

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Hi there, i just want to design and apply a 2s hanning window with 50% overlapp on my EEG signal in order to segment it , i've tried with @hann command but i couldn't get it
hello see example below the signal gets splitted in 2s buffer and windowed see the subfunction at the bottom of the code :...

12 days ago | 0

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Data fitting in between following variables x and b for quadratic equation
hello again seems to me b can be expressed as a first order polynomial of x b = 1.4952 + 0.0097108*x you can of course inc...

12 days ago | 0

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Answered
In a function we need to input the first element of matrix?
hello simply this. personnay I don't like to use the same variable name in both iput and output of a function . y = myFIRST...

12 days ago | 0

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how to plot repeating steps graph real time/animated
hello maybe this %% create animatedline object / handle figure h1 = animatedline; h1.Marker = '*'; h1.Color = [1 0 1]; ...

15 days ago | 0

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Saving 2D index ranges in a single variable
hello why not this : % Input image rawImage = rand(50, 100); % Save a 6px x 3px ROI % roi_xrange = [1:3]; % roi_yrange =...

16 days ago | 0

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Answered
To find exponent in power law equation of the form y = ax^m + b
hello try this may need some refinement for the initial guess for the parameters depending of your data a = 0.55; m = 1....

16 days ago | 0

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Selecting two values of an array randomly and reversing the values between
hello try this the output has values between 2nd and 5th data flipped n = 10; A = (1:n) % array ind1 = 2; % first inde...

16 days ago | 0

Answered
How to calculate mean within a for Loop
hello you have to index your output (mean_numerically(n)) , otherwise it get's overwritten at each iteration for n=1:length(b...

19 days ago | 0

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Rotate set of data points
hello see below the home made solution performs better than built in detrend matlab function (even with 'linear' argument) ...

22 days ago | 0

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Further processing of contour plot data
hello maybe this ? clc,close all clearvars N = 100; % <= added x = linspace(-pi,pi,N); y = linspace(0,2*pi,N); [X,Y] ...

23 days ago | 1

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Find specific area of a rotational speed curve
hi Konrad tried a few things first I think you could drastically reduce your sampling rate by a factor 1000 ! this graph do...

24 days ago | 1

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How to plot the mean value of X corresponding to each Y value?
hello yes i'm coming late in the show... nevertheles I am here !! just for the fun and FYI your data could be decimated up t...

24 days ago | 0

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Can someone help me with codes or function combination to evaluate the Average force from tdms file with four channels? Pls, see codes I applied "manually" to attempt it.
Ok so this is what I can offer you today 1/ I noticed your sampling rate could be much lower (at least factor 1000) without an...

24 days ago | 0

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correlated interference related to gaussian autoregressiv
hello weel, you where not very far from the code.... here is it NB that the for loop start at indice 3 because matlab work...

24 days ago | 0

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Why is there a diiference in state-space velocity and derivative of state space displacement?
hello where do you see a difference ? diff or gradient based dispkacement derivatives do pretty well overlay with computed...

24 days ago | 0

Answered
How to find the upper and lower curve from this binary image?
hi I really do not consider myself as an image processing guy but I wanted to try it so here we go .... see result below base...

24 days ago | 0

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Matlab fitting method to optimize the SNR in the frequency response curve to identify high error frequencies
hello this will reduce your plot noise but maybe you should improve the measurement method first ? load('Noise.mat'); s...

24 days ago | 0

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Answered
finding new frequencies of a signal with respect to another and plotting
hello first a comment : not sure why your frequencies are all normalized by fs...i changed that in my code below you need to ...

24 days ago | 0

Mathieu NOE

Hutchinson

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