Community Profile

# Daniel M

##### Last seen: 1日 前
251 2018 年以降の合計貢献数

#### Daniel M's バッジ

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...

13日 前 | 1

| 採用済み

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...

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...

| 採用済み

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...

| 採用済み

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...

| 採用済み

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...

| 採用済み

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]

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...

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

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...

2ヶ月 前 | 1

| 採用済み

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...

2ヶ月 前 | 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...

2ヶ月 前 | 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 ...

2ヶ月 前 | 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...

2ヶ月 前 | 0

| 採用済み

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 ...

2ヶ月 前 | 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...

2ヶ月 前 | 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...

2ヶ月 前 | 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...

2ヶ月 前 | 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)}...

2ヶ月 前 | 1

| 採用済み

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ヶ月 前 | 1

| 採用済み

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ヶ月 前 | 1

| 採用済み

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ヶ月 前 | 0

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ヶ月 前 | 0

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ヶ月 前 | 1

| 採用済み

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ヶ月 前 | 2

| 採用済み

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ヶ月 前 | 0

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ヶ月 前 | 1

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ヶ月 前 | 1

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ヶ月 前 | 1

| 採用済み