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: markCircle.m
    path of file: ./repos/ameshref/example1
    
    the code of the file until where you have to start completion: function [mark3,mark4] = markCircle(coordinates,elements3,elements4,C,R,h)
%markCircle:Marks all triangular or quadrilateral elements
%           with diameter > h which intersect the circle with
%           radius R and center C.
%
%Remark:
%
%    This program is a supplement to the paper 
%    >> Adaptive Mesh Refinement in 2D - An Efficient Implementation in Matlab <<
%    by S. Funken, and A. Schmidt. The reader should 
%    consult that paper for more information.   

    
function [mark3,mark4] = markCircle(coordinates,elements3,elements4,C,R,h)
%markCircle:Marks all triangular or quadrilateral elements
%           with diameter > h which intersect the circle with
%           radius R and center C.
%
%Remark:
%
%    This program is a supplement to the paper 
%    >> Adaptive Mesh Refinement in 2D - An Efficient Implementation in Matlab <<
%    by S. Funken, and A. Schmidt. The reader should 
%    consult that paper for more information.   
%
%Authors:
% 
%    S. Funken, A. Schmidt  21-08-18

if ~isempty(elements3)
  hmax  = zeros(size(elements3,1),1);
  mark3 = zeros(size(elements3,1),1);
  for j=1:3
    k = mod(j,3)+1;
    mark3 = max(mark3,intersectSegmentCircle(...
                       coordinates(elements3(:,j),:),...
                       coordinates(elements3(:,k),:),C,R));
    hmax = max(hmax,sqrt(sum((coordinates(elements3(:,j),:) ...
                             -coordinates(elements3(:,k),:)).^2,2)));
  end