choose samples in for loop

consider the for loop below, for k=1:length(X)

    if(X(k)>50)

        count=count+1;

    end

In the above case X(k) will be evaluated and condition is checked for all the values of k. I don't want to check it for all values of k, instead like every 10th or 15thh samples will do.

What should be done in this case?

Answer 1

[David Fletcher]

You could use a step in your for statement i.e.

for k=1:10:length(X)

[NIKHIL VALSAN KULANGARETH]

thanks a lot

Answer 2

[Akira Agata]

Also, you don't need to use for-loop. For example, if you want to do that every 10th samples, you can calculate count easily by:

idx = X(1:10:end) > 50;
count = count + nnz(idx);