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Mathieu NOE


Hutchinson

Last seen: Today Actif depuis 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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My Spectrogram doesn't look right, and has negative values
hello stft : use option 'FrequencyRange','onesided' to have only positive frequencies (or use spectrogram) also y log scale...

environ 2 heures il y a | 0

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A figure created within a for loop is not plotted (only the last one is shown)
hello again so there was some figure calls still present in some functions (fun1, fun2 ,...) I cleaned that so you have only ...

environ 4 heures il y a | 0

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Importing Excel file data and creating variables with the imported data
hello work with tables or structures...(read doc / help sections if your are not familiar with them ) here a starter % Impo...

environ 5 heures il y a | 0

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How to delete text file some perticular lines using Matlab script
hello its' a bit confusing.... in other words you want to keep the lines that contain a certain variable name ? then try thi...

environ 7 heures il y a | 0

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How can I extract capital words from a string
hello this is one solution (for strings) . For char array it's almost the same (you don't even need to convert back from char ...

environ 8 heures il y a | 0

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Drop data from datatime by condition
hello try this this code will remove data that are contiguous and within given bounds (here 24 hrs min and 36 hours max) th...

4 jours il y a | 1

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Remove matrix from cell array that doesn't fit required matrix size
hello this will remove the unwanted trailing data data =readtable('EURUSD=X.csv') [m,n] = size(data); k = floor(m/20)*20; ...

4 jours il y a | 0

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plotting 12 graphs for different months
hello I tweaked a bit your code load data_matrix.mat data=SECTION_L; data(:,1:3)=[]; row=9; cleanup=data([1 2 3 row],:);...

4 jours il y a | 0

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nothing assing to my variable that is in if statement
hello you need to index x in the for loop for i = 1:length(x)/2 if x(i) < 0 % here y(:,i) = Gt_new(1) end e...

4 jours il y a | 0

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plot some nodes from an .txt file
hello Alberto here you are ; use function boundary with shrink factor = 1 data = readmatrix('filename.txt'); x = data(:,1);...

4 jours il y a | 0

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Matlab Audio Filter with changing Frequency
hello again so this is a variable coefficient IIR implementation I used a white noise as test signal, the output signal show...

4 jours il y a | 0

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Easy question - How can I save this variable within the for loop?
hello If I understand correctly , n must be multiple of 10 and that's the only values of interest for A and B, no need to per...

5 jours il y a | 0

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How can I group my data per hour in order to not over count my shipping data?
hello have to admit I am not super expert in timetables , but I managed to put some code together and test it i am not sur...

5 jours il y a | 0

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Is there any matlab function to calculate moving mean square error?
hello I doubt that there is a code for that try this : (based on formula) : % dummy data n=300; x=linspace(0,2*pi,n)...

5 jours il y a | 0

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Linear envelope of an EMG signal
hello Ines there is no bug here , the plot is correct vs what matlab is supposed to do when you select 'rms' option, you can...

5 jours il y a | 0

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Eliminating the noise from the raw data using median filter
hello again is it now smooth enough ? % Remove quiet parts of a signal. clc; close all; clear; workspace; format ...

7 jours il y a | 1

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How to interpolate/resample an irregular dataset into 1 step spacing?
hello Becky try this the second case means you ask interp1 to do extrapolation, as your original x data do not covers the en...

11 jours il y a | 0

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How to simulate data from txt correctly?
hello I tried to reproduce your problem , but got the right output , not what you show... hope the attached files can help you...

12 jours il y a | 1

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import a certain text file .txt from a specific folder
hello again for numerical arrays use readmatrix instead of importdata folder = 'C:\Users\Alberto\....'; % folder where the .t...

12 jours il y a | 0

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save .TXT inside a specific folder
hello try this new_folder = 'C:\Users\....\Folder A' A = ; % matrix 200x3 double save(fullfile(new_folder, 'file.txt'), 'A...

13 jours il y a | 0

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How can I write self-invoking code for hundreds of wav files for the same loop and call those files to matlab?
hello something like this ? this demoes the excellent FEX submission Natural-Order Filename Sort - File Exchange - MATLAB ...

13 jours il y a | 1

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Identify lines that have a repetition (unique function)
hello simply this now the 4th column is your repetition quantity a=readmatrix("file.txt"); [output,ia,ic]=unique(a,'rows'...

14 jours il y a | 0

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How to compute the correlation coefficient in the two data set.
hello so once we have digitized the picture with grabit , we have two data mat files (attached) available for further processi...

14 jours il y a | 0

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Fourier Transform of window functions
hello maybe this can help you wL = 30; % window length win1 = hanning(wL); win1 = win1/sum(win1); % normalize win2 = t...

17 jours il y a | 1

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Downsampled data exceeds the input data
a demo is maybe more efficient here so the original data gets resampled at 60 Hz by using only the start / end points of the t...

17 jours il y a | 1

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smoothing with Gaussian Kernel for loop problem
hello try this lambda = 0.05; tv = (1:1:1000)'; nv =length(tv); ys = sin(4*pi*tv./max(tv))+0.25*rand(nv,1);% dummy data...

17 jours il y a | 0

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Correlation of similar Signals
hello maybe this ? define a buffer lenth and an overlap (here I took the max possible overlap) and use corrcoef (take the no...

17 jours il y a | 0

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Import not consistent table data
hello again so this first simple code will extract the data as one single block if you need to separate the data in individu...

17 jours il y a | 1

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date time from filename
hello try this code below I use fullfile instead of your method to concat folder and basename your path and filenames shoul...

19 jours il y a | 0

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creating the chorus effect without using a loop
hello the chorus effect is basically a multiple echo effect ; the echo by itself is a delayed version of the original signal ,...

20 jours il y a | 1

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