title: What is the R equivalent of numpy "stride" indexing?
body: <p>In numpy if you have an array x you can access it's elements with a 'stride' (i.e. skipping some inbetween) like so: x[::2]. How can you do this in R with a vector? I've searched all over the internet and couldn't find an answer to something so simple, kind of surprising.</p>
  
  <p>EDIT:
  I just realized that you could use seq(), but is there no built-in method for doing this?</p>