choose samples in for loop

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NIKHIL VALSAN KULANGARETH
回答： Akira Agata 2018-3-20
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?

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回答（2 个）

David Fletcher
David Fletcher 2018-3-20
You could use a step in your for statement i.e.
for k=1:10:length(X)
Akira Agata
Akira Agata 2018-3-20
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);

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