我尝试在MatLab中运行此函数：

function llik = log_likelihood(p)
global d;
N = length(d);
tau = fzero(@(t) (t - (t^2 * p + 1 - p) / (2 * (t * p + 1 - p))), [0,1]);

loglik = 0;
for i = 1 : N
    loglik = loglik + log(isnan(d(i)) * (1 - p * (1 - tau) + ~isnan(d(i))* p * (1 - tau)));
end

llik = loglik / N;
end

这里，p是一个标量。MatLab给了我一个错误警告：

Error using fzero>localFirstFcnEval
FZERO cannot continue because user-supplied function_handle ==>
@(t)(t-(t^2*p+1-p)/(2*(t*p+1-p))) failed with the error below.

 Unrecognized function or variable 'p'.

我很困惑，因为p应该是函数的自变量。它怎么可能不受欢迎呢？谢谢你的帮助!