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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Contribute at least one answer each month for 12 consecutive months
Awarded to Mathieu NOE on 02 Oct 2021
Answer 10 questions that were unanswered for more than 30 days
Awarded to Mathieu NOE on 08 Jul 2021
Accept 1 answer given by other contributors
Awarded to Mathieu NOE on 18 Mar 2021
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Awarded to Mathieu NOE on 17 Dec 2020
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Content Feed
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 ...
8 hours ago | 0
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...
9 hours ago | 0
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...
1 day ago | 0
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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...
2 days ago | 0
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...
7 days ago | 0
replacing text in a string using indexing
I win the prize ! out = strrep('qqqqqq','qqqqq','qwe') out = 'qweqwe'
7 days 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); ...
16 days 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...
16 days 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...
20 days 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...
20 days 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...
21 days 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...
22 days 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...
24 days 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...
24 days 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...
24 days 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;...
26 days 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...
26 days 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 ...
27 days 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...
27 days 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 ...
27 days 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 ...
27 days 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...
29 days 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...
30 days 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...
30 days 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...
1 month 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 ...
1 month 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...
1 month 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...
1 month 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...
1 month 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...
1 month ago | 0
| accepted
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