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: sumt1.m
    path of file: ./repos/opt_matlab/第3章/例3.1
    
    the code of the file until where you have to start completion: function [xmin,minf]=sumt1(fun,phi,Pphi,x0,x_syms,esp,type)   %罚函数法求解约束最优化
%%fun为目标函数，phi为包括目标函数、不等式和等式约束在内的罚函数，x0为初始点，

    
function [xmin,minf]=sumt1(fun,phi,Pphi,x0,x_syms,esp,type)   %罚函数法求解约束最优化
%%fun为目标函数，phi为包括目标函数、不等式和等式约束在内的罚函数，x0为初始点，
%phi为含有罚因子在内的符号变量表达式,Pphi为罚函数的表达式
if nargin==4
    type='Of'; 
    esp=1e-6;
end