title: change array to 12columns 2D dataframe
body: <p>I would like to enter a 1-D array into a data frame with 12 columns in order and fill in the missing data with null data.</p>
  
  <p>change array A to 2D dataframe like this (12 columns, 
  Fill in the missing data with NaN)</p>
  
  <p>e.g.</p>
  
  <pre><code>A = np.arange(0,30)
  </code></pre>
  
  <p>change array A to 2D dataframe like this (12 columns, 
  Fill in the missing data with NaN)</p>
  
  <pre><code>cols = ['1M', '2M', '3M','4M','5M','6M', '7M', '8M', '9M', '10M', '11M', '12M']
  df = pd.DataFrame(columns=cols)
  </code></pre>
  
  <p>....</p>
  
  <pre><code>df.head()
  
       1M   2M  3M  4M  5M  6M   7M   8M    9M   10M   11M   12M
  0     0   1   2   3   4   5     6    7     8     9    10    11
  1    12  13  14  15  16  17    18   19    20    21    22    23
  2    24  25  26  27  28  29   NaN  NaN   NaN   NaN   NaN   NaN
  </code></pre>
  
  <p><img src="https://i.stack.imgur.com/fzhTQ.png" alt="enter image description here"></p>
  
  <p>please, help me..</p>