MATLAB: Break up filtered EMG data into epochs

emg

hello,

I have a filtered EMG signal that i have to break up into 1.5s epochs so i could apply a periodogram function. But i am not sure how to break it up with a simple command.

Best Answer

Try something like this

t = linspace(0, 10, 1000);
eeg_signal = rand(size(t)); % eeg-signal
grps = ceil((t+eps).'/1.5);
eeg_split = splitapply(@(x,y) {[x, y]}, t(:), eeg_signal(:), grps);

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MATLAB: What is epoch

From to the glossary:

epoch - Presentation of the set of training (input and/or target) vectors to a network and the calculation of new weights and biases. Note that training vectors can be presented one at a time or all together in a batch.

MATLAB: Default number of epochs

In the good ol' days it used to be 100. Now it seems to be 1000.

The info in the documentation of trainlm, trainscg and probably others, needs to be updated.

clear all, clc,
x = randn(1,100);
t = x.^2;
net = newff(x,t,10);
trainfunc = net.trainFcn                         % trainlm



numepochs = net.trainParam.epochs  % 1000





net = newfit(x,t,10);
trainfunc = net.trainFcn                        % trainlm
numepochs = net.trainParam.epochs  % 1000
net = newpr(x,t,10);
trainfunc = net.trainFcn                        % trainscg

numepochs = net.trainParam.epochs  % 1000
net = fitnet(10);
trainfunc = net.trainFcn                        % trainlm
numepochs = net.trainParam.epochs  % 1000
net = patternnet(10);
trainfunc = net.trainFcn                        % trainscg
numepochs = net.trainParam.epochs  % 1000
net = feedforwardnet(10);
trainfunc = net.trainFcn                         % trainlm
numepochs = net.trainParam.epochs  % 1000

Hope this helps.

Thank you for officially accepting my answer.

Greg

Best Answer

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MATLAB: What is epoch

MATLAB: Default number of epochs

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