Arpack++ 是一款堪称神器的软件包

. 求大型矩阵的特征值和特征向量，对称矩阵或非对称矩阵都有可以求，实数阵或复数阵都可以解，因Arnoldi Method（阿诺德）而得名。 ARPACK is a collection of Fortran77 subroutines designed to solve large scale eigenvalue problems. 有两个关键词，一是Implicitly Restarted Arnoldi Method，隐式重开始Arnoldi方法。 This software is based upon an algorithmic variant of the Arnoldi process called the Implicitly Restarted Arnoldi Method (IRAM). 另一个是Reverse Communication Interface，逆通讯接口。