How do you get the size of a file in MATLAB?

Please see the dir function as stated above.

Please note that the dir function works on files and not on directories only.

>> s = dir('c:\try.c')

s = 

       name: 'try.c'
       date: '01-Feb-2008 10:45:43'
      bytes: 20
      isdir: 0
    datenum: 7.3344e+005