GETFIELD GETFIELD Get Field Contents

Usage

Given a structure or structure array, returns the contents of the
specified field.  The first version is for scalar structures, and
has the following syntax

   y = getfield(x,'fieldname')

and is equivalent to y = x.fieldname where x is a scalar (1 x 1)
structure.  If x is not a scalar structure, then y is the 
first value, i.e., it is equivalent to y = x(1).fieldname.  
The second form allows you to specify a subindex into a
structure array, and has the following syntax

    y = getfield(x, {m,n}, 'fieldname')

and is equivalent to y = x(m,n).fieldname.  You can chain multiple
references together using this syntax.
