Matlab: iterative loop

Question

I have a wav signal that I read in samples in a buffer s. I want to save in a new buffer x the samples that are in 10 position, 20, 30..110 position. How can I do this? I must write a for loop but how can I write the contator?

Answer 1

Not sure what you mean by buffer, but here's how you'd get that info out of an array. Given s = 1:107, you could get the elements starting at position 10 by issuing the command:

b = s(10:10:end);

Now, b equals 10 20 30 40 50 60 70 80 90 100

Answer 2

I want to save in a new buffer x the samples that are in 10 position, 20, 30..110 position. How can I do this?

x = s(10:10:110);

This would work too:

x = s(10*(1:11));

Houstanb's solution is best if you want every 10th sample from your buffer s, and not just up to 110 as you state.

I must write a for loop but how can I write the contator?

If you must write a for loop then you can try this:

x = nan(1,11);
for k=1:11
    x(k) = s(k*10);
end

But this is not a great solution from a MATLAB perspective, where vectorization is preferred.