# 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 to fit data on a specific region, using lsqcurvefit or any other?

hello fyi, some results obtained with the poor's man solution (based on fminsearch) NB : I changed your log10 to log in my c...

1 day ago | 0

Why does a frequency input for a chirp not work?

hello fixed a few mistakes in your code the most obvious one is when you compute a sinewave . You have to remember that you ...

1 day ago | 0

Change the period/frequency of a Van der Pol Oscillator

hello seems to me your code actually generates the correct frequency signal at 0.8 Hz , as soon as you stick with f = 0.8; ...

1 day ago | 0

finding peak points while signal processing

hello most obviousy you didn't peak the right data in this plot (a copy paste from above that I fixed below, look for the comm...

3 days ago | 0

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How to plot a temperature contour from an excel file on MATLAB ?

hello maybe this ? I am not sure to understand what you mean by i want the width to be 50 mm and the height to be 220 mm ....

3 days ago | 0

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merge multiple excel file data

hello try this to make sure to get the files in the right ordre please download first this submission Natural-Order Filenam...

3 days ago | 0

Is it possible to calculate variating signal frequency?

hello Niki try this below frequency is computed by finding a "zero" (or any other threshold value) crossing point with your ...

6 days ago | 0

How to delete odd columns and odd rows from a image

helllo try this (A is a array we keep only the even rows and columns) % create dummy A array a = (1:10); for ci = 1:10 ...

7 days ago | 0

Find min value of each column of 2D lattice and plot

not sure if I understood really what you want to do maybe this ? clc clear N = 10; [x,y] = meshgrid(1:N,1:N); xlim([1,N]...

7 days ago | 0

Plot a plane from 3 points

hello Alberto welcome back I was first a bit puzzled because you speak of "line" whereas we are talking here "plane" that goe...

7 days ago | 1

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How to accurately measure the height of a 3D structure?

hello this is my rough first trial NB that I didn't use here any surface smoothing (needs still to be implemented) but I as...

8 days ago | 1

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How to get a csv file from matlab

hi nothing complicated here - try this , I used a smaller array size for the example but it should work for your larger array ...

8 days ago | 0

Interpolated data is drifting downward

hello I don't really understand your problem and why you make the code so complicated I assumed the issue is simply you have...

8 days ago | 0

How to use isoutlier based in a part of the data?

hello why not using islocalmin ? seems to me what you want is to keep the first 3 points (corresponding to a local min) a =[...

16 days ago | 1

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Bi-linear (piecewise) curve fitting

hello try this (a fairly simple code) T1 = readtable('testdata.xlsx'); x = T1.Displacement; y = T1.BaseForce; % top fl...

16 days ago | 0

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2D plot of deformation data

hello again basically used the same code for U and V and got these 3 plots for ColorData for U for V code : data...

17 days ago | 0

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Hi , all there , i have an excel file that i want to split it by special element value in the file to some files . how can i make it possoble with matlab

hello try this I created first a dummy array with some zeros at lines 25 / 75 / 85 so the for loop will split the data with...

17 days ago | 0

Finding delay b/w two signals using gccphat

hello I think I can get the correct result with the regular xcorr function (I have not the toolbox for gccphat function) but ...

17 days ago | 0

Smoothing for multiple csv files

hello xlsread is a bit outdated , you could try more recent alternatives (readtable, readcell , readmatrix,...) suggestion be...

17 days ago | 0

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how to filter the noise of a signal

hello I was surprised to see that your signal length is very long (730185 samples) and probably you are using a quite high sam...

23 days ago | 0

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Finding row index in a matrix in which the sum of the elements is greater than 1

hello here you are S=[1,0,0;0,1,0;1,1,0;0,1,1;0,0,1] row_sum = sum(S,2); rw_ind = find(row_sum>1)

1 month ago | 0

Automatically identify two numbers within an matrix

hello Alberto welcome back ! here a demo for the 'matrix.txt' case the other one is basically the same , simply change t...

1 month ago | 0

Averaging data over array of cyclic values when cycle length is variable

hello Marie my suggestion below is based on "zero crossing" detection points, to isolate the individual segments of data (corre...

1 month ago | 0

Reading Multiple CSV Files in a Sequence

hello that's the Achille heel of the native dir command it will not sort the file names correctly you need this : Natural-O...

1 month ago | 0

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How to make a good fittings

hello sorry I don't have the curve fitting toolbox but such a simple fit can be easily done with fminsearch the constant you...

1 month ago | 1

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Distortion introduced by filtering interpolated data.

hello when you do non unique data removal and interpolation, you are introducing a little distorsion in your original signal ,...

1 month ago | 0

Broadband signal deesign

hello maybe this you can tune the frequency range , frequency spacing and amplitudes distribution according to your preferen...

1 month ago | 0

Problem with Fourier Transform fft

hello when you do the fft with a buffer length equal your signal length (as you did) you get the maximal frequency resolution...

1 month ago | 0

Index in position 1 is invalid. Array indices must be positive integers or logical values.

hello depending of your format, the command window will display more or less decimals I suspect c(i,2) = 272.0000.............

1 month ago | 1

Smoothing the Data with For Loop (Sliding Window)

hello seems to me smoothdata can do what you need plot(temperature) hold on ts = smoothdata(temperature,'gaussian',30); ...

1 month ago | 0