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Mathieu NOE


Last seen: Today |  Active since 2015

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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
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 day 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...

6 days 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 ...

7 days 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...

8 days 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...

11 days 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...

13 days 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....

23 days 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'...

25 days 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...

1 month 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...

1 month 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...

1 month 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...

2 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(...

2 months ago | 0

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Answered
Interpolate pairs of values from matrix
hello you can surely get the required x , y data for a given z value ; use contour for that purpose as shown in code example b...

3 months ago | 0

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Answered
how to extract (x) coordinates and (y) coordinates of the top boundary from bwimage
hello this is a solution that does not even require the Image processing toolbox of course I had to do a bit of gym to conver...

3 months ago | 0

Answered
Trouble in reading .tdms file
hello No toolbox required here - I simply used this Fex submission (files are attached if you prefer the fast way) ConvertTD...

3 months ago | 0

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Answered
Plot Fourier Transform (FFT) Interpolation Model into future
hello Giacomo first I corrected some minor bugs (before we dig into more technical stuff) A is an amplitude so you should t...

3 months ago | 0

Answered
Colormap generated using the information of different arrays
hello Richard again you were pretty close to the solution , but to actually make the transparency work you should replace this...

3 months ago | 1

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Answered
comment savoir si un dossier est vide
hello The dir structure will return only the two directories entries '.' and '..'. So, check length(d)==2, if that is the cas...

3 months ago | 0

Answered
Moving window percentile computation using Conv
hello maybe this ? NB it does not need conv but requires Statistics and Machine Learning Toolbox % dummy data t= 0:0.25:100;...

3 months ago | 0

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Answered
Why does the signal become thicker after noise reduction and the dots on both sides diverge?
hello again you can already get decent results with smoothdata , other smoothing techniques based on splines or NN could also ...

3 months ago | 0

Answered
extracting overlapping portions of 2 similar tracks
hello you could do something like this ... I have manually checked which track is the longest and the code works here because ...

3 months ago | 0

Answered
Matlab code to find the Wave height
hello again I am by no means an image processing expert, but sometimes I go outside my comfort zone ... hopefully my suggestion...

3 months ago | 0

Answered
how to separate the real and imaginary parts inside a cell
Maybe this ? % create dummy data n = 32; for k = 1:2 cellarray{k} = k*ones(n,n)*(1+1i*5); end % process it for ...

3 months ago | 0

Answered
Change format of field contour labels that have been manually added in a tiled layout
why not create explicitely the levels (V array) ? a = 0.98; b = 1.02; Z = peaks(99)/100 + (a+b)/2 ; XY = [-0.375:.125:.37...

3 months ago | 0

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Answered
How to find center and radius of an arc from binarized image
hello this is what I can offer you today you will need the attached function (CircleFitByTaubin.m) , and this Fex submissio...

3 months ago | 0

Answered
How do i show the "delta" difference between the two plotted curves?
hello you need to "realign" your two data sets vs common x vector - in other words we need to creat a new x vector and inter...

3 months ago | 0

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Answered
Extraction of the spatial coordinates of a curve and calculation of the normal line to each of its points
hello tried a few things here As far as I have understood correctly your question, the points you are looking for are given ...

4 months ago | 1

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Answered
Put to white the plot space outside a geometric shape
hello have you checked that the colorbar is symetric around zero (to have white color correspind to zero exactly ? ) this re...

4 months ago | 1

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Answered
Error: unrecognized function or variable "bi2de"
Thanks to this post it was easy to (re)create the missing / unknown bi2de function (see end of the code) : Most efficient way to...

4 months ago | 0

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