# 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**

Same color lines in legend using a for loop

hello why make simple things complicated ? if you have only 4 arrays to plot , you could do directly the plot like this - a...

5 dagen ago | 0

replacing text in a string using indexing

I win the prize ! out = strrep('qqqqqq','qqqqq','qwe') out = 'qweqwe'

5 dagen ago | 0

delete consecutive commas in txt file

hello maybe not the best code but seems to do the job ! filename = 'ca.txt'; a = readlines(filename); [m,~] = size(a); ...

14 dagen ago | 1

Plotting harmonic oscillators for different values of Beta

hello as mentionned by @Chris there was some missing dots in element wise operations . Others minor bugs included wrong time v...

14 dagen ago | 0

Why do I get additional frequencies using standard audiowrite BitsPerSample values?

hello if you export data to wav format , you have to make sure that the amplitude do not exceed +/- 1 otherwise the signal wil...

18 dagen ago | 0

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why my conditional function is not what I expected?

hello this works better :) close all clear all x = -3:0.1:3; y = -3:0.1:3; [X,Y] = meshgrid(x,y); [m,n]=size(X); f=ze...

18 dagen ago | 1

How can I detect a peak signal inside a periodic pulse array and generate the waveform like the figure below?

hello here you are - hope you will sleep better tonight... array_pulse = [0,0,0,0,1,1,1,1,0,0,0,0,1,1,1,1,0,0,0,0,1,1,1,1,0...

18 dagen ago | 1

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How to find unwrapped phase of a cross-spectral at frequencies of 0.1 0.2 0.3 ... 0.9 Hz?

hello minor hint : readmatrix suffices to read numerical txt files ; readtable and conversion from table to array is unnecessa...

20 dagen ago | 0

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Calling a function in function considering a loop

hello here you are. NB I prefered not to use the same "c" variable name both in the function and in the main loop - not that...

21 dagen ago | 0

Plotting the frequency spectrum of square wave generated with an osciloscope

Hello Maria when I saw this line X = fft(x,nfft) ; I thought that your intention was to do fft with averaging multiple chu...

21 dagen ago | 0

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data clipped warning while coding.

hello FYI, wav export will clip data exceeding +/- 1 range so you have to normalize the data (y) before writting to wav for...

21 dagen ago | 0

How to have diferent marker and line styles of one variable from multiple data files?

hello see my little demo t = 0:pi/50:2*pi; MarkerStyle={'o','+','*','x','s','d','v','>'}; Colors=[1 0 0; 1 0 1; 0 1 0;...

24 dagen ago | 1

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How to fix a shift issue after taking hamonic mean?

hello is there a reason why the harmonic averaging is needed here I compared it with a standard smoothing function with gaus...

24 dagen ago | 0

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Periodogram loop for multiple columns

hello we should have freq the same for all 240 columns so we are not obliged to store 240 versions of the same vector on the ...

24 dagen ago | 1

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Combining data columns from many text files into one text file of a specified order

hello try this I created some txt files with names : Point Spectroscopy Data 01.txt to Point Spectroscopy Data 03.txt to tes...

24 dagen ago | 0

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how to generate the no. in increasing order but with decreasing difference between the no.?

hello maybe this : (result : a = 10 20 28 34 38 40) % init a(1) = 10; delta = 10; iter = 5; % main ...

25 dagen ago | 0

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mixing audios according to array value

hello the simplest trick here is to first generate z with the same dimension (length) as x and y use the initial t vector ...

25 dagen ago | 0

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Como fazer gráfico de frequência fft

hello we cannot test your code as you don't provide the mat file (use the paperclip button) otherwise I can suggest you to lo...

26 dagen ago | 0

why the image is not display in the output?

hello Your I array has not much delta between min (99.5) and max value (100), so you need to help imshow autoscale its range t...

27 dagen ago | 0

How do I bin my X and Y data to plot the mean and SD?

hello quick and dirty solution code should work whatever the "zero" position is in the n array hope it helps X=[1 2 2 3 4...

27 dagen ago | 0

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Why is my title not showing when i display my image?

hello because now your image fills all the space, the title is hidden try with a smaller height : imshow(strain_image) s...

28 dagen ago | 0

Arrays have incompatible sizes for this operation.

hello in case the two files have different number of samples, either you truncate the longest one or you padd the shortest one ...

28 dagen ago | 0

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How to read .bnn.lis file (ascii file) for the specific data

hello this is one possibility : lines = readlines('SCINTILLAORS STACK WITH CHAMBER-1_21.txt'); %% main code nn = find(c...

ongeveer een maand ago | 0

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Improving fit of data to sum of cosines model

hello some findings that may interest you ... as I don't have the Curve Fitting Toolbox , this work has been done with the p...

ongeveer een maand ago | 1

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How do I evaluate the error for a fitted non-linear curve

hello using both experimental and fitted data you can compute R2 this way : function Rsquared = my_Rsquared_coeff(data,data...

ongeveer een maand ago | 0

How to calculate average for a multiple of time period

here your are , my friend the frequency is estimated by taking the fft of the velocity signal and getting the dominant peak. b...

ongeveer een maand ago | 0

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How can I find where those indesirabe plots are from ?

hello maybe this ? %% Ids(Vds) %% mu=10; Cox=3.9; W=360*(10^(-9)); L=180*(10^(-6)); K=(mu*Cox)*(W/L); Vth=1; vds=0...

ongeveer een maand ago | 0

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how to extract coordinates from g code files

hello tried a few things , this is my suggestion for the time being . Not 100% sure it's the best code , maybe someone else wi...

ongeveer een maand ago | 1

Impedance calculation using FFT from time, voltage and current battery data

hello should be possible using tfestimate function alternative (older) code : x and y are your time domain data (x = inpu...

ongeveer een maand ago | 0

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How can I convert an .xls spreadsheet to FFT format?

hello try this code . It will do averaged FFT (with overlap) and time / frequency spectrogram a few mods need still to be do...

ongeveer een maand ago | 1

| accepted