title: Count the number of positive and negative numbers in a column
body: <p>I want to count the number of positive and negative values in one of the columns of the data frame. How would I do in R?</p>
  <p>For example, here is the data frame for example</p>
  <pre><code>              logFC   logCPM       LR       PValue          FDR
  Bra15066  -5.630822 5.184586 73.79927 8.647868e-18 4.060866e-13
  Bra18809 -13.227825 7.158572 72.13478 2.009902e-17 4.719048e-13
  Bra45310  5.848073 5.244367 65.61483 5.482472e-16 8.581530e-12
  Bra44666  -4.270590 4.852193 63.75671 1.407731e-15 1.652605e-11
  Bra34292 -12.917379 4.198073 61.84715 3.711794e-15 3.485968e-11
  Bra38258  -5.239433 4.816886 57.98476 2.641567e-14 2.067378e-10
  </code></pre>
  <p>Now I would like to count the number of positive values in logFC column compared to negative values.</p>
  <p>Basically I would like to see 5 counts for negative numbers and 1 for positive number for the above df. How would I do in R?</p>