Daniel M

Last seen: 1 jour ago

251 total contributions since 2018

Daniel M's Badges

Answered
Gaussian fit to xy data and extracting FWHM
This is because of the slightly different way cftool has defined the gaussian equation for the fit, and it ends up multipling th...

11 jours ago | 1

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Answered
notch filter to remove 50Hz fundamental frequency and its second (100 Hz) and third (150Hz) harmonics. with using filter(),
'ecg' is the name of a function in the example: MATLAB/Examples/R2019a/dsp/FindHeartRateUsingPeakFinderPanelWithECGInputSignalE...

environ un mois ago | 0

Answered
cross correlation between complicated signals problem to measure delay between them
You can use the following code to get the time delay between two signals: clearvars close all clc [y1,fs1] = audioread('im...

environ 2 mois ago | 1

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How do you design your ECG bandpass?
Hi Stephan, here is a script that creates some filters and view them. You may often find that creating filters using the transfe...

environ 2 mois ago | 0

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How to remove specific colour from "surf" plot?
I don't have this dscatter function, but here is an example of how to do this with imagesc (which is similar enough that you cou...

environ 2 mois ago | 1

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Answered
Phase lag between two signals
Here's what I came up with using xcorr. It calculates that Signal 2 lags behind Signal 1 by 179.6 degrees. clearvars close al...

environ 2 mois ago | 1

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Answered
I generated a FFT Signal of sampling frequency 1kHz for 65536 column vectors of a time domain signal. I want to apply segmentation on this FFT signal to 1024 parts before applying feature extraction.
fs = 1000; t = 0:1/fs:65.536-1/fs; x = sin(2*pi*50*t); X = fft(x); X_1024 = reshape(X,1024,[]); % X_1024 --> [1024x64]

environ 2 mois ago | 0

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How can I apply median filter with sliding window for the ECG signal?
The second input of the function medfilt1 determines the window size. % Y = MEDFILT1(X,N) specifies the order, N, of the med...

environ 2 mois ago | 1

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extraction phase from ordertrack
To get the instantaneous phase of a signal x, xh = hilbert(x); xphase = angle(xh);

environ 2 mois ago | 0

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How to remove noise from the signal and identify the peaks for each cycle of the total signal
Your data has too many artifacts to allow easy processing. You would first need to visually/manually go through your data and se...

environ 2 mois ago | 1

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Answered
Performing RMS on a EEG singal
You will have to download a tool that can read EDF files. You can search the File Exchange for this, or use the Fieldtrip or EEG...

environ 2 mois ago | 0

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Help with Chirp FFT
You are plotting the incorrect frequency vector. fft() does not return the frequencies in order from most negative to most posit...

environ 2 mois ago | 0

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Reduce data points from 200 to 108
Do you want to: truncate your signal? downsample or resample interpolate something else? Truncate example: t = 1:200; x ...

environ 2 mois ago | 0

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How do you find average power?
Calculating the average power of your discrete signal according to the equation in your attached figure is done as: P = su...

environ 2 mois ago | 0

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Answered
how to contaminate ecg signal with noise
I obviously cannot run this code because I don't have the data nor any of the associated functions. By the way, you are getting ...

environ 2 mois ago | 0

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non linearity of sensor
In the figure I don't see a different value for B. I see a phase shift (C is close to but less than pi/4) and decreased amplitud...

environ 2 mois ago | 0

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Different plot shape for fft depending on time sample spacing
Your code is incomplete so I can barely comment on it. If you have trouble understanding it, you should look up the examples fro...

environ 2 mois ago | 1

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i cannot find the minimum values for matrix.
You must have overwritten 'min' as a variable, and doing min(T) is trying to index into a variable at non-integer positions. Tha...

2 mois ago | 2

Answered
Accessing field data in nonscalar structure array
Here is a solution. You'll have to write the functions differently for gathering cells and arrays. fun = @(s,field) {s.(field)}...

2 mois ago | 1

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Answered
Taking means of initial values in individual cells of structure
tracks.A = [{1:6};{10:14}]; Int2 = cellfun(@(x) mean(x(1:3)), tracks.A); % ans = [2; 11]; If instead you have a n...

2 mois ago | 1

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reduce the sampling frequency of an ecg noise signal from 360hz to 250hz ..
help resample

2 mois ago | 0

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how to speed my code up
Why do you need a loop to compute a sum? Just replace the entire function with utilization = sum(myArray(periodNumber, 1:co...

2 mois ago | 1

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Answered
Matrix dimensions must agree Error
A is [8x8] and B is [8x1]. Do you mean to do the |mrdivide| operation, "/"? Or do you mean to do element-wise division "./"? If ...

2 mois ago | 0

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When loading .mat files in a parfor, the first time is way slower than the second time.
So you're doing something like this? for k = 1:10 mydata = load('myfile.mat'); output = someFunction(mydata); end T...

2 mois ago | 0

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How do I remove the brackets from the numeric values around the zeros, so that only the numeric values are left and I am able to use boolean logic to get a solution ( 1 or 0)?
Hmm, seems like this was an opportunity to apply what you learned yesterday regarding regexprep, if you're trying to remove/repl...

2 mois ago | 1

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Answered
how can I improve this code???!!!
You should try preallocating margin before the loop. You have only set the value to one element, of zero. Since it's not clear h...

2 mois ago | 2

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Answered
Finding series/pattern in an array
If you have the signal processing toolbox you can do this pretty easily using the functions risetime and pulsewidth. You just ha...

2 mois ago | 0

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Asking the error of 'Out of memory'
You are trying to allocate memory to a matrix for more memory than is available in your RAM. The solution completely depends upo...

2 mois ago | 1

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how to plot quiver evenly along lines?
I just took a closer look and it is what I suspected. In your loop over NL1 you are only storing the outputs, D1 and D2, for the...

2 mois ago | 1

Answered
Linspace with varying increment
MATLAB provides functions that do basic things, like create linearly spaced vectors using the colon operator or linspace. It is ...

2 mois ago | 1

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