% Purpose
%    closes an EPIC System file.
%
% Synopsis
%    mexeps('close')
%
% Description
%    mexeps('close') closes the EPIC System file which has 
%    been opened for reading, writing or editing.
%
%    Note: the OPERATION is 'close' not 'epsclose'.
%
% Examples
%    mexeps('openw','output.ptr')
%    ...
%
%    mexeps('close')
%
% See Also
%    openr, openw, opene
%