MATLAB: Increment loop index based on a condition

Question

I have an array that has 100000+ values. every 3000th sample to a new array based on a condition.

1. I should compare every 3000th value and see if it differs from the previous 3000th sample by greater than 10. If so, I should add the sample, sample+100th element, sample+200th element to my new array.

2. If not, I should only add the 3000th sample element to my new array and then move to the next 3000th sample.

I have implemented this as an if-else loop inside a for loop. My problem is I am unable to increment the loop index if I first enter the if-loop and then go to the else loop next. I have tried using a while loop instead;however, the while loop executes forever and I don't get any output.

Any help is appreciated.

Thanks.

Answer 1

output = [];
for K = 6000 : 3000 : length(YourVector)
  if abs(YourVector(K) - YourVector(K-3000)) > 10
     output = [output, YourVector(K+[0 100 200])];
  else
     output = [output, YourVector(K)];
  end
end