我的程序如下：
function [out1] = psi_fun(j);

w = [0.019560533 0.071989137 0.040167837 0.065322484 0.060002773 ];

out1 = j.*w;

运行后出现以下结果：
??? function [out1] = psi_fun(j);
    |
Error: Function definitions are not permitted at the prompt or in scripts.问题出在哪儿啊？需要怎么修改呢？