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Mathieu NOE


Hutchinson

Last seen: 6 days ago Active since 2015

Followers: 6   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
Phase retrieval of a periodic signal, not working well
here a better solution without the need for fft you should not use the first peak in your code , as it does not correspond to ...

6 days ago | 0

| accepted

Answered
StartPoint on Curve Fitting Toolbox
hello here a very simple code with a 2 steps approach - a relatively accurate initial guess of Aand Q, then refined with fmin...

7 days ago | 1

| accepted

Answered
FFT plotting trouble: Concatenated inputs
hello when you do modal analysis / FRF measurements with a hammer , you should split the record into individual hit input and ...

9 days ago | 0

Answered
interpolation of a sinusoidal tunnel data
hello again so I looked a bit some of your data , and my first question would be , why not first plot your (scattered) data wit...

9 days ago | 0

Answered
Frequency response of a system operating at a fixed frequency
hello we could use the general fft approach , but you could also use the stepped sine identification method. We only need to g...

10 days ago | 1

| accepted

Answered
create a 3D smoothing with csaps (or similar)
hello again ! as your post title is about smoothing, this is what I propose , based on the fex submission : smoothn - File E...

13 days ago | 0

| accepted

Answered
3D plot matrices
hello maybe this ? M100 = [19.8 29.305 38.425 48.37; 4.9 7.4 10.0 13.65]; M300 = [19.35 31.25 40.05 50.55; 7.6 12.65 16.65 ...

14 days ago | 0

| accepted

Answered
Calculating Surface Curvature from Image Data
hello I think this is because your K array contains some high amplitude spikes that avoid you see the smaller amplitude signal...

15 days ago | 0

Answered
How to Generate Smooth Transitional Trapezoidal Signal in Simulink
hello whatever code you use to create the trapezoidal wave , you can simply then smooth it out, for example with smoothdata t...

17 days ago | 1

| accepted

Answered
Pulstran function to generate biphasic pulses
hello have to admit I almost never used pulstran yet , so I simply prefer to come back to a very simple solution with repmat i...

17 days ago | 0

Answered
How to plot isosurfaces using 3 vector columns of data?
maybe this ? pretty much what you could obtain with contour (in principe ,but I am not sure how to make contour work on your d...

17 days ago | 1

| accepted

Answered
Complex value computed by model function, fitting cannot continue. Try using or tightening upper and lower bounds on coefficients.
hello a very basic code using only fminsearch (no toolbox required ) I preferred to smooth a bit your data (otherwise it loo...

17 days ago | 0

Answered
create a 3D average curve from two 3D curves
hello Alberto and welcome back we need to sort and remove duplictes in your data before creating a common z vector, then inter...

20 days ago | 0

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Answered
Workspace sorting order of new desktop
hello maybe a stupid idea but , if that solves the problem until you find a better solution, why not ? I first thought that ...

22 days ago | 0

Answered
How do I stitch these data and get a final plot
hello maybe this ? clear all S=readmatrix ('Probe.txt'); T=S(:,[2,3]); i=0; for j=0:60:300 R=[cos(j) -s...

24 days ago | 0

Answered
How to use the attached excel file below to do a Fourier conversion and display the spectrogram?
hello you can use my "do it all" demo file below your signal has been detrended and downsampled . But I wonder what you can ...

24 days ago | 1

| accepted

Answered
Converting acceleration data to displacement data using FFT results in Zero-drift
FYI, a very simple time domain approach - assuming we don't care about the DC values , only the dynamic portion of the data is o...

24 days ago | 1

Answered
I Just Want To Read Text From URL And Save It As Txt.... But How?
hello try this textweb = webread("https://kp.gfz-potsdam.de/kpdata?startdate=2024-05-21&enddate=2024-05-26&format=kp1#kpdata...

24 days ago | 2

| accepted

Answered
To plot one stem with multiple values for data of different months.
hello @Amjad Iqbal I modified a bit your code added one line in the first for loop number_of_data_thismonth(k) = numel(...

29 days ago | 0

Answered
Find specific points of increase within multiple different data sets
hello try this... hope it helps - though I did not draw vertical lines but you have to start and ending points coordinates. I...

29 days ago | 0

| accepted

Answered
Need help for Influence line plotting
hello I believe there is no mistake in the code simply you have a fairly crude spatial resolution (fixed to 0.5 m in the cod...

30 days ago | 0

| accepted

Answered
is my code logically correct? will i get the same output when i do it manually?
hello I wondered if the exercise was more to prove that decimating then resampling (by the same factor) would give (almost) th...

30 days ago | 0

Answered
First Order Ogden Stress Strain Plot
hello I believe parentheses are missing for the last term % Stress calculation for compression stress_comp = (mu1/alpha1) *...

1 month ago | 0

Answered
Mean shift clustering - issue with finding the center of my clusters
Now probably my best contribution so far , and I post it here with maybe the hope that you will find it interesting enough to ac...

1 month ago | 1

Answered
how to count a sequence of data arrays with cut off?
hello why not simply this ? % example 1 cnr_all=[2.33 2.00 1.60 1.59 1.99]; cut_off=1.50; [~,N] = min(cnr_all - cut_o...

1 month ago | 1

Answered
graph multiple excel or csv files
hello try this if you have lot of excel files and you want to be sure they are sorted correctly (what the regular dir does ...

1 month ago | 0

Answered
Find minimum values based on unique number
hello the provided mat file contains 492 different profiles (and not 147) my suggestion so far : load('matlab.mat') pr...

1 month ago | 0

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Answered
Translate and rotate a curve
hello Mads like this ? load('pqfile.MAT') % remove NaN and correct for size mismatch A(isnan(A)) = []; F(isnan(F)) = []...

1 month ago | 0

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Answered
Subtractive Baseline-correction
hello I was first a bit puzzled when you mention the baseline is made of the first 10 samples - but after several readings it ...

1 month ago | 0

| accepted

Answered
how to delete nan values from array columns without losing data from other columns
ok, so this is now the main dishes.... have first tried this code on the first data file , will adapt to your new files as soo...

1 month ago | 0

| accepted

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