title: Extracting specific columns in numpy array
body: <p>This is an easy question but say I have an MxN matrix. All I want to do is extract specific columns and store them in another numpy array but I get invalid syntax errors.
  Here is the code:</p>
  
  <pre><code>extractedData = data[[:,1],[:,9]]. 
  </code></pre>
  
  <p>It seems like the above line should suffice but I guess not. I looked around but couldn't find anything syntax wise regarding this specific scenario.</p>