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: cat1.m
    path of file: ./repos/opt_matlab/第23章/例23.2
    
    the code of the file until where you have to start completion: function x_max=cat1(fun,catnum,SMP,SRD,iter_max,LB,UB)   %猫群算法,一次求方程的根
NC=size(LB,1);
cat=myinitialize_cat(catnum,LB,UB);
y=cat_fit(fun,cat);
[y_max,x_max]=cat_max(cat,y);%求最优值
for iter=1:iter_max
   for i=1:catnum
      if cat(i).flag==1
         for j=1:NC
             x_best=x_max(j);

    
function x_max=cat1(fun,catnum,SMP,SRD,iter_max,LB,UB)   %猫群算法,一次求方程的根
NC=size(LB,1);
cat=myinitialize_cat(catnum,LB,UB);
y=cat_fit(fun,cat);
[y_max,x_max]=cat_max(cat,y);%求最优值
for iter=1:iter_max
   for i=1:catnum
      if cat(i).flag==1
         for j=1:NC
             x_best=x_max(j);
             cat(i).v(j)=cat(i).v(j)+2.5*rand*(x_best-cat(i).v(j));
             if cat(i).v(j)>1
                cat(i).v(j)=1;
             elseif cat(i).v(j)<-1
                 cat(i).v(j)=-1;
             end