载入程序包：‘gmp’
The following objects are masked from ‘package:base’:
%*%, apply, crossprod, matrix, tcrossprod
载入程序包：‘gmp’
The following objects are masked from ‘package:base’:
%*%, apply, crossprod, matrix, tcrossprod
原文：http://www.cnblogs.com/brown-birds/p/8032122.html