Mathieu NOE

Hutchinson

Last seen: Today | Active since 2015

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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How can I select imagesc boundaries on the y-axis?
hello Kathy you needed indeed : to reverse the Y direction for imagesc How can I reverse the y-axis when I use the IMAGE ...

6 días ago | 0

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Answered
xcorr and finddelay giving erroneous results for offset sine waves
hello @James Draper see code demo below for zero crossing (with linear interpolation for best time accuracy) you have access t...

6 días ago | 0

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Extract a range of frequencies and power from X-Y vector/array
hello some minor bugs , see comments this is what you wanted : load phaseNoise.mat plot(fnew,pnew) x_index = (fnew >= 1...

7 días ago | 0

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Answered
Automate the code for data extraction
hello you can try this : folder= pwd; % put here folder where wav files are C=dir(fullfile(folder,'*.nc')); %list all n...

8 días ago | 0

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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...

13 días ago | 0

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replacing text in a string using indexing
I win the prize ! out = strrep('qqqqqq','qqqqq','qwe') out = 'qweqwe'

13 días ago | 0

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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); ...

22 días ago | 1

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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...

22 días ago | 0

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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...

26 días 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...

26 días ago | 1

Answered
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...

27 días 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...

28 días ago | 0

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Answered
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...

29 días ago | 0

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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...

29 días 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...

29 días ago | 0

Answered
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;...

alrededor de 1 mes 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...

alrededor de 1 mes ago | 0

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Answered
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 ...

alrededor de 1 mes ago | 1

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Answered
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...

alrededor de 1 mes ago | 0

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Answered
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 ...

alrededor de 1 mes ago | 0

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Answered
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 ...

alrededor de 1 mes 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...

alrededor de 1 mes ago | 0

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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...

alrededor de 1 mes ago | 0

Answered
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...

alrededor de 1 mes ago | 0

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Answered
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...

alrededor de 1 mes ago | 0

Answered
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 ...

alrededor de 1 mes ago | 0

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Answered
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...

alrededor de 1 mes ago | 0

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Answered
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...

alrededor de 1 mes 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...

alrededor de 1 mes ago | 0

Answered
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...

alrededor de 1 mes ago | 0

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Mathieu NOE

Hutchinson

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