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Mathieu NOE


Last seen: 2 days ago |  Active since 2015

Followers: 11   Following: 0

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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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Answered
How to calculate radiuses of an airfoil from its coordinates?
hello find below a demo code that computes neutral line and curvature / radiuses of airfoil . there is also a code section tha...

2 days ago | 1

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Answered
Scattered 3d data to contourf plot
hello first alternative is : % create somme dummy data N = 20; z = peaks(N); % convert to scatter points z = z(:); x ...

3 days ago | 0

Answered
Issues plotting R,theta, T from X,Y,Z data
hello when plotting the X,Y,Z data you get a cylinder or something like a cylinder with elliptical shape I removed the X di...

4 days ago | 0

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Answered
How can I make my scatter plot markers opaque, or semi transparent?
hello again a small demo to see the effect of the scatter function parameter 'MarkerFaceAlpha' on the dots transparency wit...

9 days ago | 0

Answered
Plotting Polar Plots using time series data
hello again well, maybe I'm stupid but I coud not yet figure out how to use Perfect Polar Plots without having to spend some ...

10 days ago | 1

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Answered
how to filter data by rate of change?
hello I was thinking that I could use the "baseline" correction approach, then apply a scale factor on the baseline compensat...

10 days ago | 0

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Answered
How would you implement this reverb structure
FYI this is a code that implement 3 reverbs hope it helps infile='DirectGuitar.wav'; outfile='out_reverb.wav'; % read t...

10 days ago | 0

Answered
Plot hatched bars with the hatched legends
hello is this the correct result you expect ? two simple corrections (wrong indexes) 1/ to get the correct bars hatched : ...

12 days ago | 0

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Answered
how can I link subplots (for brush data)?
tx to @NVSL for his contribution I can add these little upgrades to your code , like having only one call to readtable at each...

13 days ago | 0

Answered
time lag where the phase of the signals is not consistent
maybe this ? Split the data in smaller chuncks and do the xcorr on it. you can choose the buffer size and overlap (as you woul...

13 days ago | 1

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Answered
Plot lines with curves from csv file
maybe this ? I'm surprised to be lucky on monday morning rounded corners appears now as red arcs of circle , but there's a bit...

13 days ago | 0

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Answered
Image Processing for ultrasound
let's try some stuff ok I am not an image processing expert , so use that or not ... filename = 'image_needle.jpg'; inp...

23 days ago | 0

Answered
Reconstructing signal using the IFFT
hello try this (it works for images but also for any 2D numerical array) output = input with minimal error : max(abs(outpic...

23 days ago | 1

Answered
Why there's opposite fit results phenomenon between the oddnomial and the evennmnial?
hello I suspect this is what you wanted to do (?) load('Ranking.mat') plot(RANKING,Total);grid on hold on order = 5; % 3...

23 days ago | 1

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Answered
spectrogram x-axis match with data
hello again so the problem was simply that you inverted time and frequency vectors when calling imagesc ! I guess the mistak...

23 days ago | 0

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Answered
Animating a 2-D Array as a function of time
not really sure to understand how it should look like , but maybe .... this ? ppdtrace = 0.75+0.5*rand(1200,8); figure(1) ...

24 days ago | 0

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Answered
unable to iterate serially through files in a for loop
hello @shedrach try this as simple approach where I first look at the xls files and create a 2D array that contains month and...

24 days ago | 0

Answered
Issue with dispaly of 3D images created from multiple 2D slices
For a 3D rendering (like MRI) I suggest you try this : vol3d v2 - File Exchange - MATLAB Central %% create a 3D rendering o...

25 days ago | 0

Answered
spectrogram x-axis match with data
this can also helps you : %%Method 1: equate axis sizes for all axes after adding colorbar % Size of axes without a colorbar ...

25 days ago | 0

Answered
How to apply a threshold to gevfit?
hello you can already have a better fit without the threshold and use it only to truncate the fitted curve (but I agree it's...

26 days ago | 0

Answered
Slice Displaying Grids Instead of Color
hello again there was just one mistake : slice(x,y,z,ta,[],[],1:4); to be replaced with : slice(x,y,z,ta,[],[],kz(1:4)); beca...

27 days ago | 0

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Answered
Function 'boundary' not supported for code generation. How to solve this?
hello based on code seen here : https://fr.mathworks.com/matlabcentral/answers/299796-tight-boundary-around-a-set-of-points ...

27 days ago | 0

Answered
how do I implement a real time FFT in simulink?
hello why not simply use a counter to do the job ? (as we deal with a sinusoidal wave) you need one counter for the frequen...

1 month ago | 0

Answered
How to calculate only several frequency with FFT ?
hello try this DFT on a specified frequency - File Exchange - MATLAB Central

1 month ago | 1

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Answered
I want to use a low-pass filter to cut off frequencies above the cutoff frequency.
hello I notice that the cutoff freq is very low compared to fs , so maybe lowpass has a numerical problem when the normalized ...

1 month ago | 0

Answered
Average Curvature of a Closed 3D Surface
that's me again ! :) so a bit for my own fun , I tried a few things here I decided I wanted to define the intersection of yo...

1 month ago | 1

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Answered
Confine contour lines to region defined by data
hello sorry for not putting alot of comments, but I am in a hurry.... here 's my first suggestion, maybe a little dirty but ...

1 month ago | 0

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Answered
Fit countours to shape
arrgh - I don't have time to finish my work - it's getting very late here ... and I am not an expert in image processing also ...

2 months ago | 0

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Answered
why envelope by hilbert increasing in tail of signal?
hello again here 3 suggestions appart from the traditionnal hilbert transform see the 2 functions in attachment t = 0:0.0...

2 months ago | 0

Answered
fittting data using nonlinear optimization fminsearch
hello seems to me the data looks like a traditionnal exp decaying pulse - I don't undertsand how you can have the 1/t² ampli...

2 months ago | 0

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