[求助] 一个数学积分求解 已有1人参与

5楼: Originally posted by pippi6 at 2015-01-11 19:09:55
我用maple 7
> f:=BesselI(0, alpha*x)*alpha*exp(-alpha^2)*x*exp(-(x^2+alpha^2)/2)
> *(1-exp(-x^2/2))^1022;

> s:=int(int(f,alpha=0..infinity),x=0..infinity);
  s := 329912268758474513720 ...

2楼: Originally posted by feixiaolin at 2015-01-11 17:20:32
【0， inf】积分区间映射到【0, 1】，然后再数值求解。

3楼: Originally posted by duyang2012 at 2015-01-11 17:34:54
不懂，可以说详细一点吗，谢谢！！！...