% sta1.m
a = struct('firstname', {}, 'lastname',{}, ...
              'ex', {}, 'mp', {} );
a(1).firstname = 'John';  % sta1.m
a(1).lastname  = 'Smith';
a(1).ex        = [ 250 , 250, 330];
a(1).mp        = [  85 , 85] ;
a(2).firstname = 'Smith';
a(2).lastname  = 'Jones';
a(2).ex        = [ 200 , 200, 300];
a(2).mp        = [ 80  , 80 ] ;
whos
a(1)
a(2)
b(100) = struct('firstname', 'john', 'lastname','smith', ...
              'ex', [1 2 3], 'mp', [10 20] );
