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/Figure_and_network_model_and_method
    
    the code of the file until where you have to start completion: % .   P46 .  从起点sb到终点db通用的Floyd算法程序
function [dist,mypath]=myfloyd(a,sb,db);
% 输入
    
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

%example:
a=zeros(6); %邻接矩阵初始化
a(1,2)=50;a(1,4)=40;a(1,5)=25;a(1,6)=10;
a(2,3)=15;a(2,4)=20;a(2,6)=25;
a(3,4)=10;a(3,5)=20;
a(4,5)=10;a(4,6)=25;
a(5,6)=55;
a=a+a';
sb=1;
db=4;
%

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