title: Python - add 1D-array as column of 2D
body: <p>I want to add a vector as the first column of my 2D array which looks like : </p>
  
  <pre><code>[[  1.     0.     0.      nan]
   [  4.     4.     9.97   1.  ]
   [  4.     4.    27.94   1.  ]
   [  2.     1.     4.17   1.  ]
   [  3.     2.    38.22   1.  ]
   [  4.     4.    31.83   1.  ]
   [  3.     4.    41.87   1.  ]
   [  2.     1.    18.33   1.  ]
   [  4.     4.    33.96   1.  ]
   [  2.     1.     5.65   1.  ]
   [  3.     3.    40.74   1.  ]
   [  2.     1.    10.04   1.  ]
   [  2.     2.    53.15   1.  ]]
  </code></pre>
  
  <p>I want to add an aray [] of 13 elements as the first column of the matrix. I tried with np.stack_column, np.append but it is for 1D vector or doesn't work because I can't chose axis=1 and only do  <code>np.append(peak_values, results)</code></p>