# Mathieu NOE

### Hutchinson

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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**Content Feed**

Remove gravity component from accelerometer data

hello Francesco the simplest method is to simply remove the mean value of your signal. another approach is to use a high pass...

7 days ago | 0

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Using writetable in a for loop to create new txt/csv files for each step

hello seems you were one inch or even less to a solution . Now it was a bit unclear to me if you wanted to save the new tabl...

7 days ago | 1

How can I plot the mid-curve or interpolant between several curves?

Hello Leonardo this is my suggestion; to be able to do math between different sets of data (like doing the average) you have f...

11 days ago | 1

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Loading multiple mat files and plot them right

hello based on the first post you can do that : tested with dummy data ( commented lines) of different size ... so it works w...

11 days ago | 0

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How to alter data (multiply) from all the columns of multiple text files in a folder

hello this is my suggestion ... the natural sorting order of the files may not be critical here, but it may be helpful anoth...

11 days ago | 1

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How can I plot a data set after applying cascaded filter?

hello Soeun I did a couple of modifications / corrections in your code please note that for the notch filter , the low and hi...

11 days ago | 0

How to visualize time frequency information of time series signal using continuous wavelet transform

hello I used this FEX submission as I don't have the Wavelet Toolbox cmccrimm/Continuous-Wavelet-Transform - File Exchange -...

11 days ago | 0

How to have the input files labels in the output files

hello my 2 cents suggestion : imgFolderStokes = fullfile('Data/Stokes_Parameters/'); imgStokes = imageDatastore(imgFolderSt...

11 days ago | 0

How to compute poles-zeros using matlab?

hello I hope the coefficient in b and a are correct (then the zeros and poles are inside the unit circle ) , because the first...

11 days ago | 0

Integrate Acceleration to velocity, wrong plot

so finally... try this / adapt it to your own needs . I can further help you if needed FYI : this code does two integrations...

14 days ago | 0

Differencing Across 2 Different Sized Matrices

hello I think this works fine with a single loop : % dummy data Matrix_1 = randn(1440,721,480); Matrix_2 = randn(1440,721,...

15 days ago | 0

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How to detect point before a positive ramp

hello I have combined threshold crossing detection with second order derivative this is the result on a noisy pulse train .....

15 days ago | 0

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How to overcome reaching NaN in trying to write Secant Method?

hello there is one point that you missed , is to break / stop the iteration as soon as the variation of x becomes lower than a...

17 days ago | 0

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How to read in a .txt and arrange the data into a scheme?

hello this is the best solution (IMO) : it will generate a table with identified variables names you can easily access : ...

17 days ago | 0

FIltered signal not matching with the original signal.

hello I see that you are doing a detrend action on your data. This will remove the dc (mean) value of the signal , so no surpr...

17 days ago | 0

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calculate speed and distance from gear wheel pulses sensor

hello Frederico Had to guess the sampling rate as it's not defined in your post... so I estimated it around 100 kHz. I did a...

17 days ago | 0

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Inactivate PID controller for 3 seconds

hello simply add a switch block at the input side of the PID the first signal (input) of the switch is zero, the second is t...

18 days ago | 1

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How can I increase the size of an array that is already in the workspace with increments of 0.1?

so this is the status now : 1/ I believe I fixed a couple of issues at the end of the main code : now both linear and spline...

21 days ago | 0

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How can I increase the size of an array that is already in the workspace with increments of 0.1?

so , maybe now I acn provide an answer.... had a couple of questions to myself - and tried to solve it this way : now we hav...

21 days ago | 0

Signal smoothing for logarithmic timescale

hello you can smooth data even in log spacing a demo code is provided below. I kept the amount of samples low , so the smooth...

21 days ago | 0

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How to use bandpass filter.

Hello no bugs or special issues , but minor improvements I prefer to use the IIR filters (like butter) used with filtfilt ...

22 days ago | 1

| accepted

CASE CLOSED. THANKS YOU

hello Nabil the code below implements low and high pass filtering hope it helps T = readtable('Book1.xlsx'); time = ...

22 days ago | 1

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Extrapolation: How do I extrapolate a curve with minimum error.

hello my suggestion for exponential curve fitting and extrapolation (adjust the new time vector t2 according to your needs) ...

23 days ago | 0

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Resultant of two files

hello again in the mean time I have worked for you ... this is a code to load the data for all sections (variables) you get th...

23 days ago | 0

replace cell content of excel from matlab script

hello this is my suggestion - convert your data (numeric double) to cell array first and more robust if statement as numeric...

23 days ago | 0

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repeating step signal in real time with a hold value of 5 seconds

hello my 2 cents suggestion... adapt sampling frequency to your own needs Fs = 100; dt = 1/Fs; duration = 5 ; nb_steps = 1...

23 days ago | 0

How do I obtain the aligned sequence using distance warping

hello my suggestion below : % Example 3: % Align handwriting samples along the x-axis. load blockletterex %dtw(MATLAB1...

24 days ago | 0

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how can i animate the line using for loop and if statement

hello you can do much simpler , as x and y are fully defined in the initialization section , then you only have to loop - four...

24 days ago | 1

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I'm calculating the harmonics of a time series. How do I determine the significance of the harmonic fit onto the data?

hello why not simply compute the mean squared error between your fitted data and the input data I also tried including the se...

25 days ago | 0

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Find the difference between signal values

hello if you export the data to matlab array you can use this code; it has the benefit to use linear interpolation between sam...

28 days ago | 0

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