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Mathieu NOE


Last seen: 1 day ago |  Active since 2015

Followers: 12   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
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...

1 day 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...

1 day ago | 0

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...

1 day 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...

1 day 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) ...

2 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...

2 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...

3 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 ...

3 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...

4 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...

5 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 ...

5 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...

8 days ago | 0

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

8 days ago | 0

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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 ...

8 days 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...

15 days 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 ...

18 days 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 ...

1 month 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...

1 month 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...

1 month ago | 0

Answered
how to plot graph as file attached.
hello you can read your header file with any matlab function that read ascii / txt files . Here I opted for readlines . Still ...

2 months ago | 0

Answered
Frequency Response Function and FFT for Modal Analysis
hello yes I a coming very late in the show but maybe there is still a need for a better code you can improve the FRF estimat...

2 months ago | 0

Answered
How to find distance in a for loop using d=distance
hello the loop must stop one index value before the end also I would suggest you index the d value so you get (numel(TrackLa...

2 months ago | 1

Answered
I have created a depth map using a time of flight sensor by measuring the distances to create a depth map I am not sure if it is correct.
hello the code seems correct but the look of the 3D plot seems 'maybe) questionnable . I had a feeling that the Z values belo...

2 months ago | 0

Answered
How can I obtain accurate and high-quality FRF results?
hello again I made very few changes to the code - I think that you cannot get any better results if you use only one hit data....

2 months ago | 1

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Answered
Put arrow and its value in a plot
hello this is a simple example , based on the fex submission : arrow - File Exchange - MATLAB Central load('data_ask_MLD'...

2 months ago | 0

Answered
LQI controller is weirdly slow in response and doesn't always reach a goal on plant
hello again used a simplified version of your model and applied simple PID control (easier for real time conversion) : % Def...

2 months ago | 1

Answered
rms of noise signal
hello to get the correct result, you need two uncorrelated random generators. here you are using the same seed , so the two ou...

2 months ago | 0

Answered
Sinewave with log frequency - Shows the wrong frequency content
hello you have to compute the angle increment vs time then take the sine of that angle (or, in other words, do the integral of...

3 months ago | 0

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Answered
improve fit compared to R
hello I interpreted your question as how to fit a U shaped function to your data , so at the end I opted for a parabola , is t...

4 months ago | 0

Answered
Sampling time of matlab figure data
hello to retrieve data from a figure , you can do it by two ways : for recent releases : openfig('data points.fig'); set(...

4 months ago | 0

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