matlab共形映射，为什么不对呢

function shiyan(r)
r=r;
t=0:0.01pi:2pi;
z=rexp(it);
w=z+1./z;
plot(w);
title('w=z+1/z');
axis equal

shiyan.m

function shiyan(r)
    t=0:0.01*pi:2*pi;
    z=r*exp(i*t);
    w=z+1./z;
    plot(w);
    title('w=z+1/z');
    axis equal
end

主函数

shiyan(3)；