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
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Awarded to Mathieu NOE on 08 Jul 2021
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Awarded to Mathieu NOE on 18 Mar 2021
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Content Feed
signal wave sorting ?
hello this would be my suggestion : first , unwrap the angle data , then find the x coordinates for a given y (common) value fo...
2 días ago | 0
Is there a way to extract the numeric data from these chars?
hello you can do that (will simply combine minutes and seconds into only seconds time vector) but as your original data has r...
3 días ago | 0
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Convert audio file in a frecuency matrix
hello FYI, this is a code to do spectral analysis you can use some basic low pass / hgh pass / notch filters as well enjoy !...
4 días ago | 0
Zeigler-Nichols reaction curve
hi probably you wanted to do this : t=0:0.01:3.0; opensys=tf(5,conv([1 18],[89 87])); y_opensys=step(opensys,t); plot(t...
6 días ago | 0
Need to find "Knees" in Stress Strain curves where slope change abruptly
hello this would be my first suggestion of course the results may be sensitive to the threshold used in my method (based on ...
6 días ago | 0
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For loop on multiple sensors
hi sure it's possible for ck = 1:5 max = max(sensors(:,ck)); disp(max); end
7 días ago | 0
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Make a grid (1 x1) out of scattered insitu data and take the average of each grid that has data
hello this would be my suggestion, based on dummy data (left picture) - result appears in right picture clc clearvars %...
8 días ago | 0
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Loop Rate of Change with Negative Values
hello I assumed that the time axis in your file is as folows : first (top value) is the oldest and last (bottom) is the newest...
8 días ago | 0
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How can i generate coefficients (Num, Deno) for allpass filter?
hello try this : function [b,a]=allpass(n,Fst,Fed,mag,Fs) %Creates an allpass filter % %Syntax: % >>[b,a]=allpass(n,Fst...
8 días ago | 0
How to import files in bulk and loop over them
hello to start... an example below to show how to loop over directories and load in natural sorting order the files in each fo...
8 días ago | 0
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Loading variables from different folders containing subfolders in loop
hello an example below to show how to loop over directories and load in natural sorting ordre the files in each folder clc c...
8 días ago | 0
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Highlight peaks/dents in a heatmap imagesc()
hello a very simple code that combines surf and contour (will not draw a circle but maybe it's still a valuable solution) [X,...
10 días ago | 0
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lsqcurvefit is undefined in MathLab version R2007b
hello FYI, you can do basic curve fitting with fminsearch - without the optimization toolbox clc clearvars x = [0.9 1....
11 días ago | 0
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i am trying to code a high shelf filter with an input(.wav) audio signal . I am a student im doing this for my final year project....kindly professionals give me solution
hello as an appetizer , please read the attached txt file and see how it's implemented in the m file (filters.m) for your sp...
11 días ago | 0
Determine the Bode diagram or a transfer function with input output data without tfest
hello this is a better code ; a better transfer function estimate is based on the auto power spectra and cross spectrum betwee...
11 días ago | 1
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Why is the magnitude spectrum spreaded over certain frequency range instead of line spectrum in FFT?
hello I took the 3rd data and used my usual tool and could get the two frequencies clc clearvars option_notch = 0; % 0...
14 días ago | 1
Help with for loop and if else statement
hello here you are . Q andy must be indexed in the loop (Q(k) , y(k)) only one Q variable suffice for all cases - no need...
14 días ago | 1
I have a bunch of named test data with some missing specimens. Want to perform mathematical operations on said data automatically.
hello this is my suggestion ... I created a list of files with missing files (could be a different scenario for each group) t...
15 días ago | 0
How to insert and analyze as signal a column from a txt file.
hello and welcome in this forum ! here a starter - how to list and import multiple txt files - after remains to implement your...
15 días ago | 0
How to create a distance between labels in plot?
hello haya I have introduced a bit of randomness in the dz so that the labels will be a different heights dz = 0.2+0.5*rand(...
15 días ago | 0
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Include legends based on column names in for loop
hello see my little demo below to use the table varibales names as legend the csv data file is attached clearvars clc %...
16 días ago | 0
Plotting 2D XY values as a 3D radial contour plot
hello my 2 cents suggestion clc clearvars data = importdata('data.txt'); x = data.data(:,1); n = 200; r = linspace(mi...
17 días ago | 0
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filtfilt problem when trying to compensate for delay
hello the Hd filter was not supplied so I suggest here some standard filter (butterworth lowpass or bandpass) or smoothing tec...
17 días ago | 1
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smoothen curve plotted using discrete points
hello this would be my suggestion - others methods I tried have not been successfull flowrate = [ 0 93 100 120 140 160 172...
19 días ago | 0
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how to use loop in function to plot
hello try this I modified your function because x and y are both outputs theta = linspace(0,2*pi,100); figure(1) [x,y...
19 días ago | 0
Repeated sequence of numbers in a vector
maybe this M = [1,2,3,4,5,7,2,5,3,6,1,2,3,4,5,1,2,3,4,5,1,2,3,4,5,7,4,1,2,3,4,5,1,2,3,4,5,7,2,1,2,3,4,5] Ms = sprintf('%d',M)...
21 días ago | 0
How to load numbers from a text file to a .mat file?
hi maybe this (I assumed you want each individual value stored in a cell) the cell array can be of course saved to a mat fil...
21 días ago | 0
Finding out the minimum value position of a matrix
hello try this your answer is in r_final and c_final a=[1 2 3 4 5 10;2 3 5 6 1 12;2 6 4 5 7 16;10 2 1 4 5 20;2 3 1 4 9 12] ...
22 días ago | 0
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How to differentiate a noise signal.
hello again I think your model was correct only the solver parameters could be more adapted - now I forced the solver to use ...
22 días ago | 0
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How to read an .SRT file in order to extract data ?
hello Elias try this, hope it helps %% read one file clc clearvars filename = 'EXAMPLE.txt'; a = readlines(filename);...
24 días ago | 0
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