error on estimation SAR (Spatial Auto-regressive)

% PURPOSE: An example of using sar_jihai_time  
clear all;
W=wrook(7);

[n junk] = size(W);
In = eye(n); 

t=10;
kx = 1;
info = struct('n',n,'t',t,'rmin',0,'rmax',1,'lflag',0,'tl',1,'stl',1,'ted',1); %ted=1 or ted=2
y=randn(n,t+1);
x1=randn(n,t);
x2=randn(n,t);

y=vec(y);
if kx==0
    x=[];
else
    x=[vec(x1),vec(x2)];
     %x=[(x1),(x2)];
end

result0 = sar_jihai(y,x,W,info);
result1 = sar_jihai_time(y,x,W,info);

The error is

Undefined function or variable 'vec'.

Any help is appreciated.

[infinity]

Hello,

The error means that the "vec" variable has not been defined.

I think what you can do is to define it first.