title: How to combine structures with fields of different sizes
body: <p>I'm new to Matlab, so apologies if my language is not very specific.
  I have 25 files, one for each subject. All of them are 1x1 struct with 42 fields, but fields have different size and are of different type (e.g. struct, cell, etc) based on the subject.
  What I would like to do is to create a big structure where to keep the data of all my subjects together, because I will then need to calculate the EEG grand average for all subjects.</p>
  
  <p>However, I don't know how to create this big structure with all the data of each subject. Any suggestion would be appreciated.
  Thank you.</p>