title: Convert Pandas DataFrame to One Numpy Array
body: <p>I Have pandas dataframe like this.
  <a href="https://i.stack.imgur.com/AHuqz.png" rel="nofollow noreferrer">pd df</a></p>
  
  <p>but i want to make the 'KDB' column something like this (without the index), does anyone can help me?</p>
  
  <pre><code>[9.  3. 3.  2.  .....]
  </code></pre>
  
  <p>I tried to use pd.DataFrame.to_numpy() but what i got is something like this..</p>
  
  <pre><code>[[ 9]
   [ 3]
   [ 3]
   [ 2]
   ...]
  </code></pre>