title: Export iterations generate in different moments to a csv
body: <p>I would like to export to a csv different iterations that I create in a Rscript.</p>
  <p>I have one result (r1) then it will be export to 'MY_BOOK.CSV'</p>
  <p>Then I have another result (r2) and it will be export to 'MY_BOOK.CSV'</p>
  <p>I have the third result on my script (r3) and it will be export to 'MY_BOOK.CSV'</p>
  <p>The result in 'MY_BOOK.CSV' will be:</p>
  <p>R1
  R2
  R3</p>
  <p>Like they will be insert through they appear, not delete them.</p>
  <p>how is this possible in R?</p>