title: Ipython error " No module named 'mayavi' "
body: <p>i am trying to plot Spherical harmonics in Jupyiter Notebook. For this reason i want to use mylab from mayjavi and I get always the same error</p>
  
  <pre><code>---------------------------------------------------------------------------
  ModuleNotFoundError                       Traceback (most recent call last)
  &lt;ipython-input-1-6ab9ae7ba180&gt; in &lt;module&gt;()
  ----&gt; 1 from mayavi import mlab
    2 import numpy as np
    3 from scipy.special import sph_harm
  
  ModuleNotFoundError: No module named 'mayavi'
  </code></pre>
  
  <p>Have someone an idea, how i can fix that?</p>