# Daniel M

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**Content Feed**

How can I count the number of times a specific value appears within a range in a 1D vector?

sum(x(151:end) == 1)

environ 2 ans ago | 0

| accepted

FFT of Unsteady Temperature Data Resulting a Peak at 0 Hz

Data looks fine. You shoud plot using semilogy to better visualize the higher frequencies. Your data shows a typical 1/f noise p...

environ 2 ans ago | 0

| accepted

table on workspace isn't recognized as table

The issue is that you likely added the entire Fieldtrip toolbox to your path, which is not recommended. I am currently using Fie...

environ 2 ans ago | 0

Insufficient number of outputs from right hand side of equal sign to satisfy assignment error in fieldtrip toolbox

Fieldtrip does not recommend adding the whole toolbox to your path. Just run the function ft_defaults.m and it will do it proper...

environ 2 ans ago | 0

Plotting spectrogram for EEG data

You should plot the absolute value of your output from spectrogram or stft. Maybe even the log, or 10*log10 too (but I don't rec...

environ 2 ans ago | 0

Choosing window for stft function

There is no single correct way of doing this. All windows will have their different spectral leakage profiles, and they're all u...

environ 2 ans ago | 0

EEG-Recording in two separate files

You shouldn't try to simply concatenate them in time because there will be a discontinuity between the end of the first dataset ...

environ 2 ans ago | 0

Question

Synchronize scrolling in Left/Right view of editor

When using the editor to view multiple panes, is there a way to sync the scrollbars so they scroll together? I'm not trying to ...

environ 2 ans ago | 1 answer | 0

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answerGaussian 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...

plus de 2 ans ago | 3

| accepted

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...

plus de 2 ans ago | 0

cross correlation between complicated signals and measure the 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...

plus de 2 ans ago | 1

| accepted

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...

plus de 2 ans ago | 0

| accepted

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...

plus de 2 ans ago | 1

| accepted

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...

plus de 2 ans ago | 1

| accepted

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]

plus de 2 ans ago | 0

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...

plus de 2 ans ago | 1

extraction phase from ordertrack

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

plus de 2 ans ago | 0

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...

plus de 2 ans ago | 1

| accepted

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...

plus de 2 ans ago | 0

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...

plus de 2 ans ago | 0

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 ...

plus de 2 ans ago | 0

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...

plus de 2 ans ago | 0

| accepted

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 ...

plus de 2 ans ago | 0

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...

plus de 2 ans ago | 0

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...

plus de 2 ans ago | 1

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...

plus de 2 ans ago | 2

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)}...

plus de 2 ans ago | 2

| accepted

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...

plus de 2 ans ago | 1

| accepted

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

help resample

plus de 2 ans ago | 0

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...

plus de 2 ans ago | 1

| accepted