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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Awarded to Mathieu NOE on 09 Jun 2020
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Awarded to Mathieu NOE on 01 May 2020
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Awarded to Mathieu NOE on 09 Oct 2019
Content Feed
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...
1 day 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 ...
1 day 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
2 days 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 %...
3 days 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...
3 days 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...
3 days 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...
3 days 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...
3 days 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,...
5 days 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....
6 days 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...
6 days 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...
6 days 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...
9 days 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...
9 days 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...
9 days 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...
10 days 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(...
10 days 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 %...
11 days 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...
12 days 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...
12 days 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...
14 days 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...
14 days 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)...
16 days 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...
16 days 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] ...
17 days 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 ...
17 days 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);...
18 days ago | 0
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Playing sound using 4 channels or converting 4 channels to two
Hello Alex seems to me that none of your codes does actually mix the two songs, here you simply create a 4 channels audio fro...
19 days ago | 0
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how to control amplitude of step in code
hello simply multiply the result of the (normalized) step (input amplitude = 1) by the actual / desired input amplitude inp...
19 days ago | 0
how to calculate RMS of excel sheet having multiple channel
hello see demo code below with attached excel file I assumed the data are column oriented the rms values are stored in arr...
1 month ago | 0
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