Community Profile # 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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Create an array with only the increasing values of a pressure time series.
maybe this ? I don't see the benefit of removing the negative slope segments , this creates gaps in the signal was just sm...

3 dagar ago | 0

I have frequency sweep input signal x, and output signal y and want to know phase angle difference between them throughout the timeseries data.
Hello again I tried to extract the amplitude and phase of your x and y signals by "order extraction" , which here is simply a m...

4 dagar ago | 0

How to fill color between two curves?
hello see below FYI, your code does not need a for loop. Take advantage of matlab native vectorized operations % y1(1) = 0 ...

5 dagar ago | 0

How can I convert a .wav file to Pascals?
see here : Matlab Spectrogram: How to convert the dB values to SPL? - MATLAB Answers - MATLAB Central (mathworks.com)

10 dagar ago | 0

Matlab Spectrogram: How to convert the dB values to SPL?
hello I admit it's not always evident to know how n normalize spectrogram data , especially when now in the new matlab release...

10 dagar ago | 0

How Do I filter this zigzag wave?
following my comments above, if you use smoothn - File Exchange - MATLAB Central (mathworks.com) the 'robust' method can remove...

11 dagar ago | 0

How to load a txt file and save the workspace
you can create a structure D where all informations are stored (filenames and data) D = dir('*.txt'); % D is a structure array ...

11 dagar ago | 0

Why is the graph in this code becoming distorted?
hello maybe this ? I simply corrected one of your equation (looking at the one that follows , assumming the second was correct...

14 dagar ago | 0

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Identifying regions in matrix rows
hello I tried to put some code together and ended with that ; maybe interesting (?) it will detect the largest region for ea...

14 dagar ago | 0

How to solve error "Arrays have incompatible sizes for this operation?
hello I tried to understand what you wanted to do, and so far my suggestion is as follows : L=load("ver.mat"); t_6=(0:numel...

15 dagar ago | 0

Calculating phase delay for one signal to have the same zero crossings
hello unfortunately you did not provide (attach) the functions you are sing to generate the waveforms nevertheless, see below...

18 dagar ago | 0

Plotting one value from a vector
hello simply change this figure(2); plot(t,L.ver); into : figure(2); channel = 50; % pick value between 1 and 100 plo...

18 dagar ago | 0

Heat Map Representation of error data
hello I could suggest these two solutions either based on the regular heatmap function and creating a specific colormap the...

19 dagar ago | 0

Hovmoller Diagram: longitude (x axis), time (y axis), and z(temperature values)
hello again I modified my code so it should work now on your data as I understand we have here only 12 months of data , so my...

19 dagar ago | 1

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Draw a curve defining the bounds of a scatter plot to detect anomalous (sparse or low density) points
hello maybe this ? I simply decided that I wanted the contour line corresponding to a level 5% of F range above the min valu...

20 dagar ago | 0

I need to identify between a healthy wheel and an unhealthy wheel. The data i have were measured using ADXL345 accelerometer
hello you need to learn how to read (load) data and do your signal processing there are more than enough examples availables...

20 dagar ago | 0

Hovmoller Diagram: longitude (x axis), time (y axis), and z(temperature values)
hello maybe this ? I created some dummy data to test my code hope it helps %% dummy data 609x881x372 (lonxlatxtime) aa...

ungefär en månad ago | 0

hello try this I didn't index Z and R with k, as I suspect you want to use it right after (inside the for loop) otherwise y...

ungefär en månad ago | 0

How to use PRBS signal to identify first order transfer parameters
hello see example below from the Bode plot you can easily extract the plant dc gain (here 10) and cut off frequency (fc = 50...

ungefär en månad ago | 0

Is there a technique to merge two peaks into one peak at the midpoint?
hello maybe this ? (a low tech approach...) load('data.mat') [m,n] = size(data); %% find the two peaks location MinPeak...

ungefär en månad ago | 0

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Read multiple txt files and save them according to their name
hello maybe this is what you want A is now a cell array of structure that you can further expand if you need , for the time ...

ungefär en månad ago | 0

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write function that generates an echo to audio.Why am i getting this error
hello you code can be simplified . Also an echoed signal means you add to the original a fraction (in amplitude) of the delay...

ungefär en månad ago | 0

Generate pinknoise with same power as audio
hello this would be my suggestion . You don't need to do a fft to get the power of a signal (you can compute it directly in ti...

ungefär en månad ago | 0

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I want to extract outer points of my plot(Chaotic Data Points) and plot it with the extracted outer points.
hello maybe this ? I needed to use a refine time increment dt (1/10th of the original value) so that the outer points are c...

ungefär en månad ago | 0

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Sine Wave Becoming Increasingly Choppy
hello your sampling rate is completely wrong You want to draw a 1000 Hz sine wave , so as pointed out already by @Image Anal...

ungefär en månad ago | 1

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enter values from 0 to N (imposed value) with step of 100 on the x-axis of the bar graph
hello Alberto welcome back ! i suppose you wanted to do this matrix = [64 440; 65 489; 66 581; 67 563]; figure hbh = bar...

ungefär en månad ago | 1

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Find the optimal value to maximize a function
Hi seems to me that R curves goes up as x0 goes closer to zero (but not rqual to zero otherwise you get Inf values) also all ...

ungefär en månad ago | 0

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Txt file into matrix while skipping certain lines but storing its data
hello please try this I am using readlog to load the data (worth the try) available here : readlog - File Exchange - MATLA...

ungefär en månad ago | 0