zf=zeros(23,1);
hf(1)=0.0001259318;
for t=1:23;
log(hf(t+1))=0.000004+0.177428*zf(t)/sqrt(hf(t))+0.808882*log(hf(t));
end

这个程序运行之后显示错误如下：
Subscript indices must either be real positive integers or logicals.请高手帮我看看是怎么回事呢！