title: Not getting both coordinates when using cluster_centers_
body: <p>When I run the following</p>
  <pre><code>xtrain, xtest, ytrain, ytest = train_test_split(PR,PG,test_size=0.4,random_state = 0)
  xtrain.append(NR)
  ytrain.append(N19G)
  kmeans = KMeans(n_clusters = 5)
  kmeans.fit(xtrain,ytrain)
  clusters = kmeans.cluster_centers_
  </code></pre>
  <p>my output is:</p>
  <pre><code>[[20.        ]  
  [ 2.82666667]  
  [ 9.95918367]  
  [ 0.17924528]  
  [4.23214286]]
  </code></pre>
  <p>I am not getting the Y- Coordinate. Do I need to merge my xtrain and ytrain lists?</p>