显示 x = phi(x0); 输入参数的数目不足。

function x = fixpunkt(phi,x0)

itmax = 100;
errlim = 1.e-9;
for i=1:itmax
x = phi(x0);
if norm(x-x0)<errlim
return
end
x0 = x;
end
x = NaN;
end