# Mathieu NOE

### Hutchinson

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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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**Feeds**

Error using tsa function - Error using matlab.internal.math.interp1 Sample points must be unique.

hehe there is only one difference between the two mat files , but it was enough to create the issue >> load('TSA_DATA_OLD.mat...

1 day ago | 1

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Blend two bezier curve using partition of unity property while ensuring interpolation

hello seems to me there is a simple solution to your problem - simply combine x,y data of both curves and use unique to remove...

2 days ago | 1

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How can I smooth this data before assigning a spline to it?

hello you could do this just using basic interpolation (in log scale) and the regular smoothdata (use your own spline smoo...

2 days ago | 0

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How to plot an Implicit function with certain conditions

hello @Shai Zipori I have to say I don't do much with implicit function problems , tried using fsolve and fminbnd but was lacki...

2 days ago | 2

How to turn S11 to time domain by Matlab

hello again I am mot sure to understand the shape of the impulse response from your S11_time.txt file : why only two positive...

3 days ago | 0

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Interpolation using data from excel sheet

hello I interpreted your request as : pick one month (from 1 to 12) then define whatever latitude query , and do the interpola...

3 days ago | 0

Plotting a faired curve through a data set that curves in on itself

hello experimental airfoil data can exibit some randomness especially at high angle of attack (stall) we usually prefer to s...

4 days ago | 0

Hi, i want to plot two columns of values of data from excel, the graph includes a zero while the excel sheet doesn't. Here is my code and the graph I got vs what I should get

hello again so your arrays contains 0 after row 22 til the end, that's why your plot goes back to the origin point (this was a...

4 days ago | 0

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...

5 days 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 ...

5 days ago | 0

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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...

15 days 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...

15 days ago | 0

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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...

15 days 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<=...

17 days 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...

17 days 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...

17 days 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') ...

17 days 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('...

18 days 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 = -...

18 days 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...

18 days 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...

18 days 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...

22 days 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....

24 days 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...

24 days 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...

25 days ago | 0

Need to put symbols on curve

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

25 days 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...

25 days 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...

25 days 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...

29 days 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;...

1 month ago | 1