Mathieu NOE

Hutchinson

Last seen: 4 jours il y a | Actif depuis 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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Smooth 2D colormap based on non-evenly distributed data
hello why not simply this ? see Fex submission : RegularizeData3D - File Exchange - MATLAB Central (mathworks.com) da...

4 jours il y a | 1

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How to make an FRF with my accelerometer Data and FFT?
hello I got the correct result if I assume that your data is in g and not volts (so your analyser has already used the senso...

4 jours il y a | 1

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How to draw a 3D surface with all the given discrete points？
hello of course I tried the standard solutions (surfir, griddata etc...) but as your shape is very specific , therefore also a...

4 jours il y a | 0

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Dual axis plot for the same data, left = linear -1 0 +1, right side= linear in dB -0db inf +0db
hello something like that ? % dual plot (linear scale left , dB scale right) yleft_ticks = (-1:0.1:1); yleft_ticks_labels ...

7 jours il y a | 0

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I want to Fourier transform the 'y' function using Euler's formulas.
here you are my friend : clc x = [-pi:pi/10:pi]; sum=0; y1=0; for k=1:100 y1=(((cos(k*pi)-1).*cos(k*x))./(-pi*(k^2)))...

7 jours il y a | 1

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How can I merge different .nc files related to different time steps?
hello @bhakti here you have your u and v velcocity data stored in 4D arrays u_out and v_out as requested I tried my code with...

7 jours il y a | 0

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How to get data points from graph
hello the main code is very simple (use the attached function - credits to his creator !) https://www.mathworks.com/matlabcen...

7 jours il y a | 0

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Finding neutral axis for arbitrary 2d shape - aerofoil
hello @Selina the equations are still valid , see below how we can use them : result code : u = readmatrix('upper.txt...

7 jours il y a | 1

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how can I smooth the graph for a set of varying data points??
hello maybe this ? (I optd for a exponential fit of your lattice data) data1 = readmatrix('lattice vs time plot.xlsx'); x1...

8 jours il y a | 0

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Line of Best Fit for a time series plot
hello I am not working that much with timeseries , but IMHO, you could do the polyfit first on the raw data , otherwise you ca...

8 jours il y a | 0

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Combine figures with subplots in new figure with subplots
hello Paul like this ? % Create first figure hf_sub(1) = figure(1); hp(1) = uipanel('Parent',hf_sub(1),'Position',[0 0 1 ...

8 jours il y a | 0

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trouble making a notchfilter to remove a tone out of a wavefile
hello adapt this code to your needs you can apply multiples notches , simply create the list of frequencies here fc_no...

9 jours il y a | 0

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issue during FFT of a discrete data
hello Hamid and welcome back again you can see below that fft and my home made DFT computations give the same spectrum. Also ...

9 jours il y a | 0

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Using output of the fit function in further calculations
hello why not use the smoothed (low pass filtered) image as a new background and you remove that from the original image. In f...

11 jours il y a | 0

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Can the arrow came directly following increasing OR decreasing behaviour of the curves
hello this is my suggestion the arrow generation is done after the two for loops , so it's done once instead of 6 times I ...

11 jours il y a | 0

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How can I plot multiple signals separately as like mentioned figure for avoiding this three signals overlapping?
the solution is : Stacked plot of several variables with common x-axis - MATLAB stackedplot - MathWorks France

11 jours il y a | 1

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How to find duration of peaks/valleys in chart
hello I have nothing against findpeaks but I prefer sometimes other solutions that are simpler and faster - therefore I usuall...

11 jours il y a | 1

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I have a problem with my script. I would like to extract pH data from the coast of Cameroon or the Gulf of Guinea. Can I have some ideas on what is bugging my script and a cor
hello the provided nc file contains a lot of NaN data so don't be surprised here to get most of the time NaN as a result to y...

11 jours il y a | 0

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Draw angled ellipses around clusters on PCA plot
hello like this ? Plot ellipse on scattered 2D data - File Exchange - MATLAB Central (mathworks.com) see files in attachmen...

14 jours il y a | 0

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plot the fundamental harmonic wave
hello again so this is it, we do a single frequency DFT (aka order extraction) at the second harmonic (as we have two period of...

15 jours il y a | 0

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Linear fit in loglog plot
hello maybe this ? you can make a much more compact code , as shown below : struct_load = load('mystruct.mat'); xdata = s...

16 jours il y a | 0

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How to save the result of each loop separately
hello some solutions : y = [3 4]; for k=1:length(y) % solution 1 : store as cell array x{k} =zeros(y(k),2); ...

17 jours il y a | 1

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Extracting portions of data using indices
hello Alexandra and welcome back ! I tried this , let me know if it's what you needed the output cell (Gait_cycles) contain ...

17 jours il y a | 0

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How to detect & fitting curvature from the binary image?
hello this would be my suggestion, based on this Fex submission : smoothn - File Exchange - MATLAB Central (mathworks.com) ...

17 jours il y a | 0

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I want to calculate the Moving RMS on first break pics for seismic data.
hello again see below , now you have the RMS values displayed in the legend (or you wanted to make a separate plot ? ) % De...

18 jours il y a | 0

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k-means segmentation for Raman analysis
hello I get something quite different from your expectation first I looked at first group of excel files coordinates_group1....

18 jours il y a | 0

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How do I create a matrix that is only the frequencies within the COI of a wavelet transform coherence?
so now the final code the idea is to create a mask so that wtc values that lies below the coi curve are zeroed % specific co...

18 jours il y a | 0

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Why is the filtered signal mirroring the raw one ?
hello I think what you interpret as "mirrored" peaks is just pure luck, for the good reason that there are no scientific reaso...

18 jours il y a | 0

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How do I optimize graph size?
hello first idea would be to use a Y log scale so it would reduce the black curve peak and you would see better the blue and r...

18 jours il y a | 0

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How to find time of rising and falling edges
hello see file attached , this is a good starting point here we want to measure (in samples) the time difference (period) be...

21 jours il y a | 0

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Mathieu NOE

Hutchinson

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