[求助] 二维正态概率密度函数

6楼: Originally posted by feixiaolin at 2013-11-25 17:12:56
1) 直接计算
Integrate[exp*Integrate), {x, 0, Infinity} ]
结果出不来！

2）变两分离，分步计算
Integrate[ exp, {y, 0, x}
结果为sqrt(2*pi)*(erf((x-1)/sqrt(8))+ erf(1/sqrt(8)))
进一步有：
sqrt(2* ...

2楼: Originally posted by feixiaolin at 2013-11-25 13:17:43
mathmatics没有分离变量的智慧。

2楼: Originally posted by feixiaolin at 2013-11-25 13:17:43
mathmatics没有分离变量的智慧。