# 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

**Content Feed**

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)

5 days 前 | 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...

5 days 前 | 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...

5 days 前 | 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 ...

5 days 前 | 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...

9 days 前 | 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...

9 days 前 | 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...

10 days 前 | 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...

13 days 前 | 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...

13 days 前 | 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...

13 days 前 | 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...

14 days 前 | 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...

14 days 前 | 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...

14 days 前 | 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...

26 days 前 | 0

for loop arcgridread files

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...

27 days 前 | 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...

27 days 前 | 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...

28 days 前 | 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 ...

28 days 前 | 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...

28 days 前 | 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...

1 month 前 | 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...

1 month 前 | 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...

1 month 前 | 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...

1 month 前 | 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 ...

1 month 前 | 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...

1 month 前 | 0

How can I take the average of certain columns in each excel sheets

hello Marion see my example below (the dummy excel file is attached) hope it helps % Importing Data from excel across mult...

2 months 前 | 0

How to calculate 8 days mean from ten years data?

ok so we have to do the processing for each year and pay attention to the remaining (variable length) days NB that as we now h...

2 months 前 | 0

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Fitting a model to my data using non linear least square fit method

hello try this , hope it helps results : m = 24.5179 q = 1.2078 data = readmatrix('LVD_AE.xlsx'); x = data(:,1...

2 months 前 | 0

How to fit an equation (catenary equation in 2D) to a 3D dataset (experimental data of a catenary curve in 3D) ?

This is a lazy (tired) guy answer i figure out I could easily transform the 3D array into 2D then do a parabola fit (yes I know...

2 months 前 | 1

Combining vectors in a for loop to form a final matrix

For small tables / arrays I don't pay too much attention to preallocation (but it's important if you are dealing with large data...

2 months 前 | 0

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