Question

I have a set of data that I need to analyse. I am trying to work out how to use a for loop to partition the data into 5 – 10 second blocks. I am very new to MatLab and have no idea how i would go about doing this. Any help would be much appreciated.

Answer 1

Assuming you have a vector of samples x, and a sampling frequency fs (in Hz), then you can first reshape your vector into a matrix:

x = reshape(x, fs*W, []);

where W is the window length (in seconds). Each column in now a separate window of data.¹

You can then process each window (i.e. each column) in turn:

for i = 1:size(x,2)
    process(x(:,i));
end

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_{1. This assumes that x contains an exact integer number of windows.}