function value = file_exist ( file_name )

%% FILE_EXIST reports whether a file exists.
%
%  Modified:
%
%    29 October 2004
%
%  Author:
%
%    John Burkardt
%
%  Parameters:
%
%    Input, character FILE_NAME, the name of the file.
%
%    Output, logical FILE_EXIST, is TRUE if the file exists.
%
  fid = fopen ( file_name );

  if ( fid == -1 ) 
    value = 0;
  else
    fclose ( fid );
    value = 1;
  end