Create a sliding window

Hey guys, thanks in advance

I have this code, that gives me a vector, samples , that has 10 000 000 values( a lot). I wanted to divide this vector in 500 000 samples do all the processing code I have , and choose the next 500 000 samples, with a sliding window, till i finished all the samples.

So first iteration I wanted samples(1:500 000), 2nd iteration(501000: 1000000), etc...

But with a sliding window function, can I do that

Thank you

Answer 1

[Image Analyst]

Ten million samples is not a lot, but anyway a simple intuitive way is

for k = 1 : 500000 : length(vec) % Should be 20 iterations if vec is 10 million long.
    thisWindow = vec(k : k + 499999);
    % Now do something with thisWindow.
end

Answer 2

[Matt J]

matrix=reshape(vector,5e5,[])

This gives a matrix whose i-th window is matrix(:,i). How best to process that, though, depends on the specifics of the sliding window operation.

[Miguel Albuquerque]

With that Im not getting a sliding window, I needed to change the values in the matrix, is that faster of producing a for cycle instead, for example?

[Matt J]

It can be faster. For example, if you are calculating the mean over each window,

mean( reshape(vector,5e5,[]) )

will be faster than looping.