# 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**

How can I get more divisions in x- and y- axes scaling when plotting with imagesc to have a clear picture and introduce the proper scaling along x- & y- axes?

hello simply specify the number of points when you call linspace here I introduced N = 500 (N = 100 by default) N = 500; [x...

ongeveer 19 uur ago | 0

Clean noisy data from images

hello this is a simple exponential fit using polyfit I had to do a bit of manual tweaks first to slect the appropriate data ...

ongeveer 19 uur ago | 0

Fit gaussian to X-Y data (one X column, multiple Y column), for each Y column from an excel file.

coming late in the show try this ... if your data is "good" you can this this result , otherwise the fit may not allow any F...

11 dagen ago | 1

draw the amplitude-frequency characteristic curve of a particular transfer function

Simply used your info and coded in matlab you have now here the right half of the plot , if you need both negative and positiv...

11 dagen ago | 0

How to fix my linear fit model?

yet another simple solution, using fminsearch (the no toolbox solution) % data laser = [0 1 2 3 4 5 6 7 8 10 11 12 13 14 15 16...

11 dagen ago | 1

How to fix my linear fit model?

hello simply change your equation for the second part with a x shift rajaarvo = @(I) 0.1*I.*(I>=0 & I<18)+25*I.*(I>=18 & I<=...

13 dagen ago | 1

Plot change in velocity

hello again we could use gradient or the function provided below then all vectors are of same size (101 samples) which allo...

13 dagen ago | 0

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How can I fix "Index in position 2 exceeds array bounds" in for loop?

hello to make your code work, b should be initiallized with same dimensions as a (as a vector, not just one scalar) also it's...

13 dagen ago | 0

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Identify local minima in 3D plot/coordinate data

hello this is what you need : Find local minima - MATLAB islocalmin - MathWorks France try this load('sampledata.mat') ...

13 dagen ago | 0

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Environmental data band-pass filter

it's me again :) ! I'm just guessing, maybe this is what you wanted (baseline correction) clc clear; data_datalog = load('...

14 dagen ago | 0

How do I count the number of times my graph crosses two separate lines?

hello maybe this ? the second plot shows the valid points (Ncounts = 4) % dummy data n = 5000; x = 50*(0:n-1)/n; y = -...

14 dagen ago | 0

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How to combine two data file in one file?

hello try this : IQ_data = [2756.00000000000 - 1252.00000000000i 2681.00000000000 - 992.000000000000i 2540.00000000000 - 6...

14 dagen ago | 0

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Adding specified loop outputs

hello again seems to me you want to sum the first 3 rows so it should be : Sum1=sum(output(1:3,:)); instead of Sum1=su...

14 dagen ago | 1

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How to find Quadratic Equivalent Damping?

hello again with some delay, here now the code modified and extended of course we already had the (equivalent) linear damping...

18 dagen ago | 0

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Problem in finding the correct Chebyshev interpolation line

hello maybe this ? %% Data input x_data = [1830; 1920; 1940; 1975; 2000; 2020]; %x values y_data = [0.089; 3.52; 4.86; 17....

20 dagen ago | 0

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Why does the psd of my filtered signal perfectly overlap my raw signal's one?

hello see code below, the effect of the low pass filter is clearly to be seen on the psd plot now I wonder whatkind of "activ...

20 dagen ago | 1

Plotting phase noise vs offset frequency of an optoelectronic oscillator...

hello the main problem is that your data has a very coarse frequency resolution so if I remove the content below 10GHz , rem...

21 dagen ago | 0

Need to put symbols on curve

Like that ? %===========================================================% clc close all; clear; workspace; %===========...

21 dagen ago | 0

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Shift Filter outputs to align peaks

hello @Chunru sorry but I was a bit skeptical about your solution based on group delay seems to me the "aligned" output signa...

21 dagen ago | 1

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Can I smoothen the cdfplot() result?

some more code to look at - I kept only the best solutions , even though there are probably lot of other solutions also I intr...

21 dagen ago | 1

How to do optimization coding for minimize peak width ?

hello I simply added a for loop for the del parameter to see how peak amplitude and peak width of the red curve would evolve v...

25 dagen ago | 0

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While loop using up to input and fixing input definition

Hello gain, so this is the code with the small changes mentionned above clc clearvars close all fs = 20e3; numFilts = 32;...

29 dagen ago | 1

required assistance in fitting

so this is the poor"s man optimization (w/o any toolbox) a brute force approach , let's create a 2 parameter grid and evaluate ...

ongeveer een maand ago | 0

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I wanted to combine 100 csv files for plotting in Matlab. All the files have same number of columns and rows. Can anyone help?

maybe this ? here I wanted to do a vertical concatenation - up to you to change that portion of the code also , if processi...

ongeveer een maand ago | 0

High Frequency Noise baseline filter

hello again an explosive blast record will have a very wide frequency range , the spectrogram will tell you that the signal e...

ongeveer een maand ago | 0

Plot velocity profiles along a slope

hello again so this is a starter , would need further work to define correct range of the ruler according to your data %% cre...

ongeveer een maand ago | 0

How to delete every nth column in table?

maybe this ? X = (1:9)'*(1:10:50); % remove only 2nd column t = array2table(X,'VariableNames',{'t' 'x' 'y' 'z' 'r'}) t(...

ongeveer een maand ago | 0

How would i change this code so that it plots all of the circular paths and markers all at once instead of one after the other?

simply commenting the inner for loop , and you get this result : (I also reduced the number of theta points by factor 2 ) : th...

ongeveer een maand ago | 0

How to automatically identify and fit segments of a force-distance curve in MATLAB?

hello maybe this ? I simply wanted stright lines (polyfit order 1) I suggest x0,y0 and x1,y1 as possible candidates for th...

ongeveer een maand ago | 0

Impact location detection from accelerometer data

hello so this would be my suggestion I hope my conclusion is not completely wrong ! At the end it seems I can clearly see ...

ongeveer een maand ago | 0