Question

急！如何用Matlab表达积分上限函数？

我现在需要用Matlab表示正态分布的分布函数F(t)，该函数为积分上限函数。可Matlab的quad、quad8等函数都要求积分上下限为一常量，我也想尝试将该积分上限函数积出来，但发现被积函数不可积。我已经想不出办法了，只能求教网络上的高人了。

哪位能提供一个方法表达出这个函数呢？非常感谢！！

Answer 1

The function of F(t) does not have closed form in theory. Therefore a lot of tables were created and attached in old fashion text books.

In Matlab you can use function normcdf() in the Statistics Toolbox to calculate F(t), for example:
>> format long;
>> normcdf(3,0,1)

ans =

0.99865010196837

You can also use function qfunc() in the Communications Toolbox or funcion erf() to build up normcdf(). All these functions have simple relations.