title: How to scan all rows but only first column at a matlab matrix
body: <p>I would like to scan a matrix all rows. Take all first columns or x columns and put them into another new matrix. How can i do that ?</p>
  
  <p>example matrix below</p>
  
  <pre><code>    input_matrix_training={
  {0.645569620253164,0.443037974683544,0.177215189873418,0.0253164556962025};
  {0.620253164556962,0.379746835443038,0.177215189873418,0.0253164556962025};
  {0.594936708860759,0.405063291139241,0.164556962025316,0.0253164556962025};
  }
  </code></pre>
  
  <p>For example lets scan rows and make new matrix with only first column</p>
  
  <p>result : <code>0.645569620253164, 0.620253164556962, 0.594936708860759</code></p>
  
  <p>thank you</p>
  
  <p>matlab,matrix</p>