title: What is the value of 10j in SciPy?
body: <p>I am learning Python and SciPy. I met below two expressions: </p>
  
  <pre><code>a = np.concatenate(([3], [0]*5, np.arange(-1, 1.002, 2/9.0)))
  </code></pre>
  
  <p>and </p>
  
  <pre><code>b = np.r_[3,[0]*5,-1:1:10j]
  </code></pre>
  
  <p>The two expressions output the same array. I don't understand 10j in the 2nd expression. What is its value? Thanks a lot for help. </p>