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**Feeds**

How to apply a linear ramp to start and end of several EEG epochs to attenuate the abrupt onset and offset?

@Elaine, I will assume you have imported the EEG data into vector x, with T*Fs rows, where T=3 s=record duration, and Fs=sampli...

11 days ago | 0

| accepted

Contour plot from x and y data points with corresponding contour level

@Chris Nemecek. The code below plots the x,y coords of the data, in order to give insight get into the spatial sampling. The c...

17 days ago | 0

Identifying all elements and their nodal coordinates given all possible nodes

@Sadie, You want to "identify every single square element". Do you have a preferred format for the "identified" faces? What do...

19 days ago | 0

How to make the colorbar/colormap with colors the same as ANSYS in Matlab?

@Lidianne Mapa, [edit: Fix spelling errors in my remarks. No changes to the code.] x=0:.01:6; y=0:.01:2; [X,Y]=meshgrid(x,y);...

20 days ago | 1

| accepted

If I have an array and I need to find an element in the array how do I go about it?

@Joseph, states = [1 0 0; 1 1 0; 0 1 0; 0 1 1; 0 0 1; 1 0 1; 1 1 1]; C = [1 1 0]; for i=1:length(states), if states(i,:)==C, ...

20 days ago | 1

Lead Concatenation in ECG Classification Using CWT: Required or Optional?

@Sabrine, I assume you have read this paper, published in 2021: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7831114/ The auth...

20 days ago | 0

Smoothing or special techniques to resolve uncertain peaks are required!!

@한 박, You ask "how can I make this data as smooth as a sin function?". You could fit the data with a sinusoid. Here is an exam...

22 days ago | 1

How to make curve fitting by spline between two Arcs

@sila, If you connect the two curves with a semicircle, then the first derivatives match at the connecting points. However, the...

22 days ago | 0

Random squares/rectangles in a square

@Tony Haines, So you want option B. OK. Ns=5; % number of squares P=zeros(4,2,Ns); % vertex coords ...

23 days ago | 0

| accepted

Random squares/rectangles in a square

@Tony Haines, Do you want A. One random square inside the unit square, and you want choose that random square 5 times, and ea...

24 days ago | 1

How to add a sum of frequency band or a specific frequency to the wsst function

@Luccas S., Compute wsst, and plot its magnitude: load mtlb dt = 1/Fs; t = 0:dt:numel(mtlb)*dt-dt; [sst,f] = wsst(mtlb,Fs);...

24 days ago | 1

| accepted

Applying a phase shift to a complex signal vector

@Maxime Zelenko. [Edit: In case it is not obvious, x is the original signal, and y is the phase-shifted signal.] Since you are...

24 days ago | 0

Band-pass filter extraction.

@Claudio Iturra, Use a lower low frequency and a higher high frequency when specifying the bandpass filter, and consider using ...

25 days ago | 0

| accepted

How to code the equation below?

@Athira T Das, I haven;t looked at the code, but I think the first equation is incorrect. You write which appears to be mis...

28 days ago | 0

Google Earth Trajectory Path

@Aleyna, You need to put the rocket coordinates into a KML file, and make a link to the KML file from goodgle earth. THat is e...

30 days ago | 0

what is the peak amplitude of fft?

@Claudio Gerosa, The peak amplitudes of a signal in the time and frequency domains are different. This is true even when ther...

1 month ago | 0

How the extract EEG data according to different epoch limits?

@Elaine, Are you using EEGLAB? If so, I recommend you post your quesiton to the EEGLAB mailing list - see here. The answer ...

1 month ago | 0

Fourier Series,Spectral Analysys

@Tudor Valentin, [edit: fix spelling errors] Here is an example to assist you. The example below uses fft() to compute the spe...

1 month ago | 0

Make histogram for array of datetimes

@dormant, I am switching my comment to be an answer which is what I had intended. First, let's create an array of 1273 random d...

1 month ago | 0

How to write this function in Matlab having inner product

@SHAHID, This is a standard definition of inner product for continuous functions. The limits of integration, 0 to 1 in your ex...

1 month ago | 0

Population Growth Model Analysis

@Athanasios Paraskevopoulos, I see that you have f = @(tau, N) ar_b * N * (1 - N/Ka) - N / (1 + N); and syms N eqn = ar_b *...

1 month ago | 0

| accepted

Where do I get the Data Set of EMG Signals with Standard features

@C PRASAD, Here is a link to one dataset of normal EMGs: https://springernature.figshare.com/articles/dataset/Metadata_record_...

1 month ago | 0

How can we compare several time series data qualitatively and quantitatively?

@Jake, It is hard to say without having the actual data. If you restrict your analysis to one variable at a time, then you may...

1 month ago | 1

| accepted

cross correlation between two time series data

@Sandipan, I looked at the plots you provided. You say "Their temporal variation shows a mixed pattern of correlation and anti...

1 month ago | 1

How to mark step changes of various sizes

@Justin, You may want to differentiate your signal with diff(), and then use findpeaks(). Differentiation amplifies high frequ...

1 month ago | 0

| accepted

Platform velocity different than 0 in ECEF coordinates

@Carlos, %% Satellite scenario parameters mission.StartDate = datetime(2023,10,9,7,10,0,TimeZone="America/New_York"); mission...

1 month ago | 0

spectrum(x, log="no",span=5, plot=FALSE) similar command in Matlab.

@Zakia Hossain, The curve fiutting toolbox in Matlab includes the function smooth(). By default, smooth applies a moving averag...

1 month ago | 0

Problem with 3D Meshgrid - Not understanding why some planes are 0 which results in my dx becoming 0

@Elias Larsson, For clarity, consider an example in which dx,dy,dz differ, and in which the number of elements differ for each ...

1 month ago | 1

| accepted

how to plot contour for arbitrary shape (not rectangular) in matlab?

@sajad sajad, You can make a MxN grid of points that cover the X-Y extent of your shape, and define the Z values at those poi...

2 months ago | 0

How to extract data from a MATLAB figure containing multiple line plots and save it in a file?

@Shreeja, See here.

2 months ago | 0