[R] Subsetting data systematically

[gibberish]

I would like to subset data from a larger dataset and generate a smaller
dataset.  However, I don't want to use sample() because it does it randomly. 
I would like to take non-random subsamples, for example, every 2nd number,
or every 3rd number.  Is there a procedure that does this? 

Thanks, Nate

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