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: ex_magnetostatics5.m
    path of file: ./repos/featool-multiphysics/examples
    
    the code of the file until where you have to start completion: function [ fea, out ] = ex_magnetostatics5( varargin )

    
function [ fea, out ] = ex_magnetostatics5( varargin )
%EX_MAGNETOSTATICS5 Magnetic field test model.
%
%   [ FEA, OUT ] = EX_MAGNETOSTATICS5( VARARGIN ) Magnetic field test model.
%
%   Accepts the following property/value pairs.
%
%       Input       Value/{Default}        Description
%       -----------------------------------------------------------------------------------
%       sfun        string {sflag2}        Shape function for pressure
%       hmax        scalar {0.1}           Grid size
%       iplot       scalar 0/{1}           Plot solution (=1)
%                                                                                         .
%       Output      Value/(Size)           Description
%       -----------------------------------------------------------------------------------
%       fea         struct                 Problem definition struct
%       out         struct                 Output struct

% Copyright 2013-2023 Precise Simulation, Ltd.


cOptDef = { 'sfun',     'sflag2';
            'hmax',     0.1;
            'iplot',    1;
            'tol',      1e-2;
            'fid',      1 };
[got,opt] = parseopt(cOptDef,varargin{:});
fid       = opt.fid;


% Geometry and grid generation.
fea.sdim = { 'x' 'y' };
fea.grid = rectgrid( round(1/opt.hmax) );
fea.grid.s( selcells(fea,'y<=(0.5+sqrt(eps))') ) = 2;


% Problem definition.
fea = addphys( fea, @magnetostatics );
fea.phys.ms.eqn.coef{3,end