title: Averaging different sized (3D)matrices
body: <p>I have three matrices with dimensions C11a=(1000x12x10), C11k=(1000x12x10), and C1c(1000x12x9). For description lets say they represent (datapoints x exercises x trials). I am trying to find the mean output for each exercise over all three tests but am having trouble due to the different sized matrices. Any help is appreciated! Thanks</p>
  
  <p>What I have so far:</p>
  
  <pre><code>1L= mean(C11a);
  2L= mean(C11k);
  3L= mean(C11c);
  left= (3,1L,3L,4L);
  Out=mean(left,3)
  </code></pre>