title: Extract the count of positive and negative values from an array
body: <p>I need to work with an array to make some computations. I have the following data: </p>
  
  <pre><code>x = [[81, 68, 71, 71, 67, -72], [79, 77, 88, 88, 59, -71], [67, 71, 68, 68, 85, -66]]
  </code></pre>
  
  <p>and I would need to play with the data and extract from each column the number of positive and negative values so the output should be like:</p>
  
  <pre><code>positive_value = [3,3,3,3,0]
  negative_vaue = [0,0,0,0,3]
  </code></pre>
  
  <p>I gave it a try using a <code>for</code> loop with no success and with Numpy as well, but I do not really know how to use it.</p>
  
  <p>What is the best way to get that result?</p>