Daniel M
249 total contributions since 2018
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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...
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...
5 jours ago | 0
Answered
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...
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...
8 jours ago | 0
| accepted
Answered
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...
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...
9 jours ago | 1
| accepted
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...
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...
9 jours ago | 1
| accepted
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]
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]
12 jours ago | 0
Answered
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...
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...
12 jours ago | 1
Answered
extraction phase from ordertrack
To get the instantaneous phase of a signal x, xh = hilbert(x); xphase = angle(xh);
extraction phase from ordertrack
To get the instantaneous phase of a signal x, xh = hilbert(x); xphase = angle(xh);
13 jours ago | 0
Answered
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...
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...
15 jours ago | 1
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...
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...
16 jours ago | 0
Answered
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...
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...
16 jours ago | 0
Answered
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 ...
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 ...
16 jours ago | 0
Answered
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...
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...
16 jours ago | 0
| accepted
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 ...
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 ...
16 jours ago | 0
Answered
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...
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...
17 jours ago | 0
Answered
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...
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...
17 jours ago | 1
Answered
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...
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...
18 jours 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)}...
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)}...
19 jours ago | 1
| accepted
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...
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...
20 jours ago | 1
| accepted
Answered
reduce the sampling frequency of an ecg noise signal from 360hz to 250hz ..
help resample
reduce the sampling frequency of an ecg noise signal from 360hz to 250hz ..
help resample
21 jours ago | 0
Answered
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...
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...
21 jours ago | 1
| accepted
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 ...
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 ...
21 jours ago | 0
Answered
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...
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...
22 jours ago | 0
Answered
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...
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...
23 jours ago | 1
| accepted
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...
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...
24 jours ago | 2
| accepted
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...
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...
24 jours ago | 0
Answered
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...
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...
24 jours ago | 1
Answered
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...
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...
24 jours 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 ...
Linspace with varying increment
MATLAB provides functions that do basic things, like create linearly spaced vectors using the colon operator or linspace. It is ...
25 jours ago | 1
| accepted
Answered
Problem of finding lag when using xcorr
Yes, running this gives a max lag at 0. That is indicating that y matches x the best in their current positions. Shifting y by a...
Problem of finding lag when using xcorr
Yes, running this gives a max lag at 0. That is indicating that y matches x the best in their current positions. Shifting y by a...
25 jours ago | 1
Answered
decrease calculation accuracy to speed up running time
The reason your algorithm is taking so much time is because of the line COPT(u+1,:)=[]; What happens when you delete an entry ...
decrease calculation accuracy to speed up running time
The reason your algorithm is taking so much time is because of the line COPT(u+1,:)=[]; What happens when you delete an entry ...
25 jours ago | 4
| accepted
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