You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: cs_esep.m
    path of file: ./repos/SuiteSparse/CSparse/MATLAB/CSparse
    
    the code of the file until where you have to start completion: function [a,b] = cs_esep (A)
%CS_ESEP find an edge separator of a symmetric matrix A
%   [a,b] = cs_esep(A) finds a edge separator s that splits the graph of A
%   into two parts a and b of roughly equal size.  The edge separator is the
%   set of entries in A(a,b).

    
function [a,b] = cs_esep (A)
%CS_ESEP find an edge separator of a symmetric matrix A
%   [a,b] = cs_esep(A) finds a edge separator s that splits the graph of A
%   into two parts a and b of roughly equal size.  The edge separator is the
%   set of entries in A(a,b).
%
%   Example:
%       Prob = ssget ('HB/bcsstk01') ; A = Prob.A ;
%       [a,b] = cs_esep (A) ;
%       cspy (A (a,b)) ;
%
%   See also CS_NSEP, CS_SEP, CS_ND, SYMRCM.

% CSparse, Copyright (c) 2006-2022, Timothy A. Davis. All Rights Reserved.
% SPDX-License-Identifier: LGPL-2.1+

p = symrcm (A) ;
n2 = fix (size(A,1)/2) ;
a = p (1:n2) ;
b = p (n2+1:end