title: Constructing a vector with 6N elements in python
body: <p>So I am trying to define a vector with 6N length such that it looks as such:</p>
  <p>{x_0,...,X_(N-1),y_0,...,y_(N-1),z_0,...z_(N-1),v_x0,...,v_x(N-1),v_y0,...,v_y(N-1),v_z0,...,v_z(N-1)}</p>
  <p>I understand that I can make an N element vector by</p>
  <pre><code>N = #some number#
  w = [None] * N
  </code></pre>
  <p>but having the 6N confuses me (probably more than it should). I am pretty new to all this so I appreciate your help, ultimately I will have to compute the derivative of some elements in the vector, but one step at a time! Thank you!</p>