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: myfloyd.m
    path of file: ./repos/Mathematical_Modeling/Mathematical_Modeling_Algorithms_and_Applications_Second_Edition_Procedures_and_Data/04第4章
    
    the code of the file until where you have to start completion: function [dist,mypath]=myfloyd(a,sb,db);
% 输入：a―邻接矩阵，元素(aij)是顶点i到j之间的直达距离，可以是有向的
% sb―起点的标号；db―终点的标号
% 输出：dist―最短路的距离；% mypath―最短路的路径
n=size(a,1); path=zeros(n);
for k=1:n
    for i=1:n
        for j=1:n

    
function [dist,mypath]=myfloyd(a,sb,db);
% 输入：a―邻接矩阵，元素(aij)是顶点i到j之间的直达距离，可以是有向的
% sb―起点的标号；db―终点的标号
% 输出：dist―最短路的距离；% mypath―最短路的路径
n=size(a,1); path=zeros(n);
for k=1:n
    for i=1:n
        for j=1:n
            if a(i,j)>a(i,k)+a(k,j)
                a(i,j)=a(i,k)+a(k,j);
                path(i,j)=k;
            end